vendor/llvm/llvm-trunk-r302069

35 files changed, 742 insertions, 365 deletions

diff --git a/include/llvm/ADT/APInt.h b/include/llvm/ADT/APInt.h
index 6d74f344aad5..63c92c1a7fce 100644
--- a/include/llvm/ADT/APInt.h
+++ b/include/llvm/ADT/APInt.h
@@ -86,7 +86,7 @@ private:
   union {
     uint64_t VAL;   ///< Used to store the <= 64 bits integer value.
     uint64_t *pVal; ///< Used to store the >64 bits integer value.
-  };
+  } U;
 
   unsigned BitWidth; ///< The number of bits in this APInt.
 
@@ -98,7 +98,9 @@ private:
   ///
   /// This constructor is used only internally for speed of construction of
   /// temporaries. It is unsafe for general use so it is not public.
-  APInt(uint64_t *val, unsigned bits) : pVal(val), BitWidth(bits) {}
+  APInt(uint64_t *val, unsigned bits) : BitWidth(bits) {
+    U.pVal = val;
+  }
 
   /// \brief Determine if this APInt just has one word to store value.
   ///
@@ -143,16 +145,16 @@ private:
     // Mask out the high bits.
     uint64_t mask = WORD_MAX >> (APINT_BITS_PER_WORD - WordBits);
     if (isSingleWord())
-      VAL &= mask;
+      U.VAL &= mask;
     else
-      pVal[getNumWords() - 1] &= mask;
+      U.pVal[getNumWords() - 1] &= mask;
     return *this;
   }
 
   /// \brief Get the word corresponding to a bit position
   /// \returns the corresponding word for the specified bit position.
   uint64_t getWord(unsigned bitPosition) const {
-    return isSingleWord() ? VAL : pVal[whichWord(bitPosition)];
+    return isSingleWord() ? U.VAL : U.pVal[whichWord(bitPosition)];
   }
 
   /// \brief Convert a char array into an APInt
@@ -258,7 +260,7 @@ public:
       : BitWidth(numBits) {
     assert(BitWidth && "bitwidth too small");
     if (isSingleWord()) {
-      VAL = val;
+      U.VAL = val;
       clearUnusedBits();
     } else {
       initSlowCase(val, isSigned);
@@ -300,20 +302,21 @@ public:
   /// @brief Copy Constructor.
   APInt(const APInt &that) : BitWidth(that.BitWidth) {
     if (isSingleWord())
-      VAL = that.VAL;
+      U.VAL = that.U.VAL;
     else
       initSlowCase(that);
   }
 
   /// \brief Move Constructor.
-  APInt(APInt &&that) : VAL(that.VAL), BitWidth(that.BitWidth) {
+  APInt(APInt &&that) : BitWidth(that.BitWidth) {
+    memcpy(&U, &that.U, sizeof(U));
     that.BitWidth = 0;
   }
 
   /// \brief Destructor.
   ~APInt() {
     if (needsCleanup())
-      delete[] pVal;
+      delete[] U.pVal;
   }
 
   /// \brief Default constructor that creates an uninteresting APInt
@@ -321,7 +324,7 @@ public:
   ///
   /// This is useful for object deserialization (pair this with the static
   ///  method Read).
-  explicit APInt() : VAL(0), BitWidth(1) {}
+  explicit APInt() : BitWidth(1) { U.VAL = 0; }
 
   /// \brief Returns whether this instance allocated memory.
   bool needsCleanup() const { return !isSingleWord(); }
@@ -373,7 +376,7 @@ public:
   /// This checks to see if the value has all bits of the APInt are set or not.
   bool isAllOnesValue() const {
     if (isSingleWord())
-      return VAL == WORD_MAX >> (APINT_BITS_PER_WORD - BitWidth);
+      return U.VAL == WORD_MAX >> (APINT_BITS_PER_WORD - BitWidth);
     return countPopulationSlowCase() == BitWidth;
   }
 
@@ -428,7 +431,7 @@ public:
   /// \returns true if the argument APInt value is a power of two > 0.
   bool isPowerOf2() const {
     if (isSingleWord())
-      return isPowerOf2_64(VAL);
+      return isPowerOf2_64(U.VAL);
     return countPopulationSlowCase() == 1;
   }
 
@@ -461,7 +464,7 @@ public:
     assert(numBits != 0 && "numBits must be non-zero");
     assert(numBits <= BitWidth && "numBits out of range");
     if (isSingleWord())
-      return VAL == (WORD_MAX >> (APINT_BITS_PER_WORD - numBits));
+      return U.VAL == (WORD_MAX >> (APINT_BITS_PER_WORD - numBits));
     unsigned Ones = countTrailingOnesSlowCase();
     return (numBits == Ones) &&
            ((Ones + countLeadingZerosSlowCase()) == BitWidth);
@@ -472,7 +475,7 @@ public:
   /// Ex. isMask(0x0000FFFFU) == true.
   bool isMask() const {
     if (isSingleWord())
-      return isMask_64(VAL);
+      return isMask_64(U.VAL);
     unsigned Ones = countTrailingOnesSlowCase();
     return (Ones > 0) && ((Ones + countLeadingZerosSlowCase()) == BitWidth);
   }
@@ -481,7 +484,7 @@ public:
   /// the remainder zero.
   bool isShiftedMask() const {
     if (isSingleWord())
-      return isShiftedMask_64(VAL);
+      return isShiftedMask_64(U.VAL);
     unsigned Ones = countPopulationSlowCase();
     unsigned LeadZ = countLeadingZerosSlowCase();
     return (Ones + LeadZ + countTrailingZeros()) == BitWidth;
@@ -639,8 +642,8 @@ public:
   /// conversions.
   const uint64_t *getRawData() const {
     if (isSingleWord())
-      return &VAL;
-    return &pVal[0];
+      return &U.VAL;
+    return &U.pVal[0];
   }
 
   /// @}
@@ -686,7 +689,7 @@ public:
   /// \returns true if *this is zero, false otherwise.
   bool operator!() const {
     if (isSingleWord())
-      return VAL == 0;
+      return U.VAL == 0;
     return countLeadingZerosSlowCase() == BitWidth;
   }
 
@@ -700,7 +703,7 @@ public:
   APInt &operator=(const APInt &RHS) {
     // If the bitwidths are the same, we can avoid mucking with memory
     if (isSingleWord() && RHS.isSingleWord()) {
-      VAL = RHS.VAL;
+      U.VAL = RHS.U.VAL;
       BitWidth = RHS.BitWidth;
       return clearUnusedBits();
     }
@@ -713,11 +716,11 @@ public:
   APInt &operator=(APInt &&that) {
     assert(this != &that && "Self-move not supported");
     if (!isSingleWord())
-      delete[] pVal;
+      delete[] U.pVal;
 
     // Use memcpy so that type based alias analysis sees both VAL and pVal
     // as modified.
-    memcpy(&VAL, &that.VAL, sizeof(uint64_t));
+    memcpy(&U, &that.U, sizeof(U));
 
     BitWidth = that.BitWidth;
     that.BitWidth = 0;
@@ -734,11 +737,11 @@ public:
   /// \returns *this after assignment of RHS value.
   APInt &operator=(uint64_t RHS) {
     if (isSingleWord()) {
-      VAL = RHS;
+      U.VAL = RHS;
       clearUnusedBits();
     } else {
-      pVal[0] = RHS;
-      memset(pVal+1, 0, (getNumWords() - 1) * APINT_WORD_SIZE);
+      U.pVal[0] = RHS;
+      memset(U.pVal+1, 0, (getNumWords() - 1) * APINT_WORD_SIZE);
     }
     return *this;
   }
@@ -752,7 +755,7 @@ public:
   APInt &operator&=(const APInt &RHS) {
     assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
     if (isSingleWord())
-      VAL &= RHS.VAL;
+      U.VAL &= RHS.U.VAL;
     else
       AndAssignSlowCase(RHS);
     return *this;
@@ -765,11 +768,11 @@ public:
   /// the LHS.
   APInt &operator&=(uint64_t RHS) {
     if (isSingleWord()) {
-      VAL &= RHS;
+      U.VAL &= RHS;
       return *this;
     }
-    pVal[0] &= RHS;
-    memset(pVal+1, 0, (getNumWords() - 1) * APINT_WORD_SIZE);
+    U.pVal[0] &= RHS;
+    memset(U.pVal+1, 0, (getNumWords() - 1) * APINT_WORD_SIZE);
     return *this;
   }
 
@@ -782,7 +785,7 @@ public:
   APInt &operator|=(const APInt &RHS) {
     assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
     if (isSingleWord())
-      VAL |= RHS.VAL;
+      U.VAL |= RHS.U.VAL;
     else
       OrAssignSlowCase(RHS);
     return *this;
@@ -795,10 +798,10 @@ public:
   /// the LHS.
   APInt &operator|=(uint64_t RHS) {
     if (isSingleWord()) {
-      VAL |= RHS;
+      U.VAL |= RHS;
       clearUnusedBits();
     } else {
-      pVal[0] |= RHS;
+      U.pVal[0] |= RHS;
     }
     return *this;
   }
@@ -812,7 +815,7 @@ public:
   APInt &operator^=(const APInt &RHS) {
     assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
     if (isSingleWord())
-      VAL ^= RHS.VAL;
+      U.VAL ^= RHS.U.VAL;
     else
       XorAssignSlowCase(RHS);
     return *this;
@@ -825,10 +828,10 @@ public:
   /// the LHS.
   APInt &operator^=(uint64_t RHS) {
     if (isSingleWord()) {
-      VAL ^= RHS;
+      U.VAL ^= RHS;
       clearUnusedBits();
     } else {
-      pVal[0] ^= RHS;
+      U.pVal[0] ^= RHS;
     }
     return *this;
   }
@@ -865,9 +868,9 @@ public:
     assert(ShiftAmt <= BitWidth && "Invalid shift amount");
     if (isSingleWord()) {
       if (ShiftAmt == BitWidth)
-        VAL = 0;
+        U.VAL = 0;
       else
-        VAL <<= ShiftAmt;
+        U.VAL <<= ShiftAmt;
       return clearUnusedBits();
     }
     shlSlowCase(ShiftAmt);
@@ -913,11 +916,11 @@ public:
   void ashrInPlace(unsigned ShiftAmt) {
     assert(ShiftAmt <= BitWidth && "Invalid shift amount");
     if (isSingleWord()) {
-      int64_t SExtVAL = SignExtend64(VAL, BitWidth);
+      int64_t SExtVAL = SignExtend64(U.VAL, BitWidth);
       if (ShiftAmt == BitWidth)
-        VAL = SExtVAL >> (APINT_BITS_PER_WORD - 1); // Fill with sign bit.
+        U.VAL = SExtVAL >> (APINT_BITS_PER_WORD - 1); // Fill with sign bit.
       else
-        VAL = SExtVAL >> ShiftAmt;
+        U.VAL = SExtVAL >> ShiftAmt;
       clearUnusedBits();
       return;
     }
@@ -938,9 +941,9 @@ public:
     assert(ShiftAmt <= BitWidth && "Invalid shift amount");
     if (isSingleWord()) {
       if (ShiftAmt == BitWidth)
-        VAL = 0;
+        U.VAL = 0;
       else
-        VAL >>= ShiftAmt;
+        U.VAL >>= ShiftAmt;
       return;
     }
     lshrSlowCase(ShiftAmt);
@@ -1059,7 +1062,7 @@ public:
   bool operator[](unsigned bitPosition) const {
     assert(bitPosition < getBitWidth() && "Bit position out of bounds!");
     return (maskBit(bitPosition) &
-            (isSingleWord() ? VAL : pVal[whichWord(bitPosition)])) !=
+            (isSingleWord() ? U.VAL : U.pVal[whichWord(bitPosition)])) !=
            0;
   }
 
@@ -1074,7 +1077,7 @@ public:
   bool operator==(const APInt &RHS) const {
     assert(BitWidth == RHS.BitWidth && "Comparison requires equal bit widths");
     if (isSingleWord())
-      return VAL == RHS.VAL;
+      return U.VAL == RHS.U.VAL;
     return EqualSlowCase(RHS);
   }
 
@@ -1265,7 +1268,7 @@ public:
   bool intersects(const APInt &RHS) const {
     assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
     if (isSingleWord())
-      return (VAL & RHS.VAL) != 0;
+      return (U.VAL & RHS.U.VAL) != 0;
     return intersectsSlowCase(RHS);
   }
 
@@ -1273,7 +1276,7 @@ public:
   bool isSubsetOf(const APInt &RHS) const {
     assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
     if (isSingleWord())
-      return (VAL & ~RHS.VAL) == 0;
+      return (U.VAL & ~RHS.U.VAL) == 0;
     return isSubsetOfSlowCase(RHS);
   }
 
@@ -1333,10 +1336,10 @@ public:
   /// \brief Set every bit to 1.
   void setAllBits() {
     if (isSingleWord())
-      VAL = WORD_MAX;
+      U.VAL = WORD_MAX;
     else
       // Set all the bits in all the words.
-      memset(pVal, -1, getNumWords() * APINT_WORD_SIZE);
+      memset(U.pVal, -1, getNumWords() * APINT_WORD_SIZE);
     // Clear the unused ones
     clearUnusedBits();
   }
@@ -1348,9 +1351,9 @@ public:
     assert(BitPosition <= BitWidth && "BitPosition out of range");
     WordType Mask = maskBit(BitPosition);
     if (isSingleWord())
-      VAL |= Mask;
+      U.VAL |= Mask;
     else
-      pVal[whichWord(BitPosition)] |= Mask;
+      U.pVal[whichWord(BitPosition)] |= Mask;
   }
 
   /// Set the sign bit to 1.
@@ -1369,9 +1372,9 @@ public:
       uint64_t mask = WORD_MAX >> (APINT_BITS_PER_WORD - (hiBit - loBit));
       mask <<= loBit;
       if (isSingleWord())
-        VAL |= mask;
+        U.VAL |= mask;
       else
-        pVal[0] |= mask;
+        U.pVal[0] |= mask;
     } else {
       setBitsSlowCase(loBit, hiBit);
     }
@@ -1395,9 +1398,9 @@ public:
   /// \brief Set every bit to 0.
   void clearAllBits() {
     if (isSingleWord())
-      VAL = 0;
+      U.VAL = 0;
     else
-      memset(pVal, 0, getNumWords() * APINT_WORD_SIZE);
+      memset(U.pVal, 0, getNumWords() * APINT_WORD_SIZE);
   }
 
   /// \brief Set a given bit to 0.
@@ -1407,9 +1410,9 @@ public:
     assert(BitPosition <= BitWidth && "BitPosition out of range");
     WordType Mask = ~maskBit(BitPosition);
     if (isSingleWord())
-      VAL &= Mask;
+      U.VAL &= Mask;
     else
-      pVal[whichWord(BitPosition)] &= Mask;
+      U.pVal[whichWord(BitPosition)] &= Mask;
   }
 
   /// Set the sign bit to 0.
@@ -1420,7 +1423,7 @@ public:
   /// \brief Toggle every bit to its opposite value.
   void flipAllBits() {
     if (isSingleWord()) {
-      VAL ^= WORD_MAX;
+      U.VAL ^= WORD_MAX;
       clearUnusedBits();
     } else {
       flipAllBitsSlowCase();
@@ -1500,9 +1503,9 @@ public:
   /// uint64_t. Otherwise an assertion will result.
   uint64_t getZExtValue() const {
     if (isSingleWord())
-      return VAL;
+      return U.VAL;
     assert(getActiveBits() <= 64 && "Too many bits for uint64_t");
-    return pVal[0];
+    return U.pVal[0];
   }
 
   /// \brief Get sign extended value
@@ -1512,9 +1515,9 @@ public:
   /// int64_t. Otherwise an assertion will result.
   int64_t getSExtValue() const {
     if (isSingleWord())
-      return SignExtend64(VAL, BitWidth);
+      return SignExtend64(U.VAL, BitWidth);
     assert(getMinSignedBits() <= 64 && "Too many bits for int64_t");
-    return int64_t(pVal[0]);
+    return int64_t(U.pVal[0]);
   }
 
   /// \brief Get bits required for string value.
@@ -1534,7 +1537,7 @@ public:
   unsigned countLeadingZeros() const {
     if (isSingleWord()) {
       unsigned unusedBits = APINT_BITS_PER_WORD - BitWidth;
-      return llvm::countLeadingZeros(VAL) - unusedBits;
+      return llvm::countLeadingZeros(U.VAL) - unusedBits;
     }
     return countLeadingZerosSlowCase();
   }
@@ -1575,7 +1578,7 @@ public:
   /// of ones from the least significant bit to the first zero bit.
   unsigned countTrailingOnes() const {
     if (isSingleWord())
-      return llvm::countTrailingOnes(VAL);
+      return llvm::countTrailingOnes(U.VAL);
     return countTrailingOnesSlowCase();
   }
 
@@ -1587,7 +1590,7 @@ public:
   /// \returns 0 if the value is zero, otherwise returns the number of set bits.
   unsigned countPopulation() const {
     if (isSingleWord())
-      return llvm::countPopulation(VAL);
+      return llvm::countPopulation(U.VAL);
     return countPopulationSlowCase();
   }
 
@@ -1646,7 +1649,7 @@ public:
       uint64_t I;
       double D;
     } T;
-    T.I = (isSingleWord() ? VAL : pVal[0]);
+    T.I = (isSingleWord() ? U.VAL : U.pVal[0]);
     return T.D;
   }
 
@@ -1660,7 +1663,7 @@ public:
       unsigned I;
       float F;
     } T;
-    T.I = unsigned((isSingleWord() ? VAL : pVal[0]));
+    T.I = unsigned((isSingleWord() ? U.VAL : U.pVal[0]));
     return T.F;
   }
 
@@ -1718,7 +1721,7 @@ public:
     // get 0. If VAL is 0, we get WORD_MAX which gets truncated to
     // UINT32_MAX.
     if (BitWidth == 1)
-      return VAL - 1;
+      return U.VAL - 1;
 
     // Handle the zero case.
     if (isNullValue())
diff --git a/include/llvm/CodeGen/CommandFlags.h b/include/llvm/CodeGen/CommandFlags.h
index 317a5d3f54c8..0d898827efc6 100644
--- a/include/llvm/CodeGen/CommandFlags.h
+++ b/include/llvm/CodeGen/CommandFlags.h
@@ -346,29 +346,21 @@ static inline void setFunctionAttributes(StringRef CPU, StringRef Features,
                                          Module &M) {
   for (auto &F : M) {
     auto &Ctx = F.getContext();
-    AttributeList Attrs = F.getAttributes(), NewAttrs;
+    AttributeList Attrs = F.getAttributes();
+    AttrBuilder NewAttrs;
 
     if (!CPU.empty())
-      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeList::FunctionIndex,
-                                       "target-cpu", CPU);
-
+      NewAttrs.addAttribute("target-cpu", CPU);
     if (!Features.empty())
-      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeList::FunctionIndex,
-                                       "target-features", Features);
-
+      NewAttrs.addAttribute("target-features", Features);
     if (DisableFPElim.getNumOccurrences() > 0)
-      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeList::FunctionIndex,
-                                       "no-frame-pointer-elim",
-                                       DisableFPElim ? "true" : "false");
-
+      NewAttrs.addAttribute("no-frame-pointer-elim",
+                            DisableFPElim ? "true" : "false");
     if (DisableTailCalls.getNumOccurrences() > 0)
-      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeList::FunctionIndex,
-                                       "disable-tail-calls",
-                                       toStringRef(DisableTailCalls));
-
+      NewAttrs.addAttribute("disable-tail-calls",
+                            toStringRef(DisableTailCalls));
     if (StackRealign)
-      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeList::FunctionIndex,
-                                       "stackrealign");
+      NewAttrs.addAttribute("stackrealign");
 
     if (TrapFuncName.getNumOccurrences() > 0)
       for (auto &B : F)
@@ -382,8 +374,8 @@ static inline void setFunctionAttributes(StringRef CPU, StringRef Features,
                     Attribute::get(Ctx, "trap-func-name", TrapFuncName));
 
     // Let NewAttrs override Attrs.
-    NewAttrs = Attrs.addAttributes(Ctx, AttributeList::FunctionIndex, NewAttrs);
-    F.setAttributes(NewAttrs);
+    F.setAttributes(
+        Attrs.addAttributes(Ctx, AttributeList::FunctionIndex, NewAttrs));
   }
 }
 
diff --git a/include/llvm/DebugInfo/CodeView/CVRecord.h b/include/llvm/DebugInfo/CodeView/CVRecord.h
index 086d6dff11c5..ac8aaafeadc1 100644
--- a/include/llvm/DebugInfo/CodeView/CVRecord.h
+++ b/include/llvm/DebugInfo/CodeView/CVRecord.h
@@ -53,7 +53,7 @@ struct VarStreamArrayExtractor<codeview::CVRecord<Kind>> {
   typedef void ContextType;
 
   static Error extract(BinaryStreamRef Stream, uint32_t &Len,
-                       codeview::CVRecord<Kind> &Item, void *Ctx) {
+                       codeview::CVRecord<Kind> &Item) {
     using namespace codeview;
     const RecordPrefix *Prefix = nullptr;
     BinaryStreamReader Reader(Stream);
diff --git a/include/llvm/DebugInfo/CodeView/ModuleDebugFileChecksumFragment.h b/include/llvm/DebugInfo/CodeView/ModuleDebugFileChecksumFragment.h
index a5a3b851b841..6c08c9aa2137 100644
--- a/include/llvm/DebugInfo/CodeView/ModuleDebugFileChecksumFragment.h
+++ b/include/llvm/DebugInfo/CodeView/ModuleDebugFileChecksumFragment.h
@@ -21,6 +21,8 @@
 namespace llvm {
 namespace codeview {
 
+class StringTable;
+
 struct FileChecksumEntry {
   uint32_t FileNameOffset;    // Byte offset of filename in global stringtable.
   FileChecksumKind Kind;      // The type of checksum.
@@ -35,7 +37,7 @@ public:
   typedef void ContextType;
 
   static Error extract(BinaryStreamRef Stream, uint32_t &Len,
-                       codeview::FileChecksumEntry &Item, void *Ctx);
+                       codeview::FileChecksumEntry &Item);
 };
 }
 
@@ -55,8 +57,8 @@ public:
 
   Error initialize(BinaryStreamReader Reader);
 
-  Iterator begin() const { return Checksums.begin(); }
-  Iterator end() const { return Checksums.end(); }
+  Iterator begin() { return Checksums.begin(); }
+  Iterator end() { return Checksums.end(); }
 
   const FileChecksumArray &getArray() const { return Checksums; }
 
@@ -66,20 +68,22 @@ private:
 
 class ModuleDebugFileChecksumFragment final : public ModuleDebugFragment {
 public:
-  ModuleDebugFileChecksumFragment();
+  explicit ModuleDebugFileChecksumFragment(StringTable &Strings);
 
   static bool classof(const ModuleDebugFragment *S) {
     return S->kind() == ModuleDebugFragmentKind::FileChecksums;
   }
 
-  void addChecksum(uint32_t StringTableOffset, FileChecksumKind Kind,
+  void addChecksum(StringRef FileName, FileChecksumKind Kind,
                    ArrayRef<uint8_t> Bytes);
 
   uint32_t calculateSerializedLength() override;
   Error commit(BinaryStreamWriter &Writer) override;
-  uint32_t mapChecksumOffset(uint32_t StringTableOffset) const;
+  uint32_t mapChecksumOffset(StringRef FileName) const;
 
 private:
+  StringTable &Strings;
+
   DenseMap<uint32_t, uint32_t> OffsetMap;
   uint32_t SerializedSize = 0;
   llvm::BumpPtrAllocator Storage;
diff --git a/include/llvm/DebugInfo/CodeView/ModuleDebugFragmentRecord.h b/include/llvm/DebugInfo/CodeView/ModuleDebugFragmentRecord.h
index b98c8605592c..f68f21b224f1 100644
--- a/include/llvm/DebugInfo/CodeView/ModuleDebugFragmentRecord.h
+++ b/include/llvm/DebugInfo/CodeView/ModuleDebugFragmentRecord.h
@@ -57,8 +57,6 @@ private:
   ModuleDebugFragment &Frag;
 };
 
-typedef VarStreamArray<ModuleDebugFragmentRecord> ModuleDebugFragmentArray;
-
 } // namespace codeview
 
 template <>
@@ -66,13 +64,17 @@ struct VarStreamArrayExtractor<codeview::ModuleDebugFragmentRecord> {
   typedef void ContextType;
 
   static Error extract(BinaryStreamRef Stream, uint32_t &Length,
-                       codeview::ModuleDebugFragmentRecord &Info, void *Ctx) {
+                       codeview::ModuleDebugFragmentRecord &Info) {
     if (auto EC = codeview::ModuleDebugFragmentRecord::initialize(Stream, Info))
       return EC;
     Length = Info.getRecordLength();
     return Error::success();
   }
 };
+
+namespace codeview {
+typedef VarStreamArray<ModuleDebugFragmentRecord> ModuleDebugFragmentArray;
+}
 } // namespace llvm
 
 #endif // LLVM_DEBUGINFO_CODEVIEW_MODULEDEBUGFRAGMENTRECORD_H
diff --git a/include/llvm/DebugInfo/CodeView/ModuleDebugInlineeLinesFragment.h b/include/llvm/DebugInfo/CodeView/ModuleDebugInlineeLinesFragment.h
index 177367c111c3..348497cbf7f2 100644
--- a/include/llvm/DebugInfo/CodeView/ModuleDebugInlineeLinesFragment.h
+++ b/include/llvm/DebugInfo/CodeView/ModuleDebugInlineeLinesFragment.h
@@ -20,6 +20,8 @@ namespace llvm {
 namespace codeview {
 
 class ModuleDebugInlineeLineFragmentRef;
+class ModuleDebugFileChecksumFragment;
+class StringTable;
 
 enum class InlineeLinesSignature : uint32_t {
   Normal,    // CV_INLINEE_SOURCE_LINE_SIGNATURE
@@ -42,11 +44,10 @@ struct InlineeSourceLine {
 }
 
 template <> struct VarStreamArrayExtractor<codeview::InlineeSourceLine> {
-  typedef codeview::ModuleDebugInlineeLineFragmentRef ContextType;
+  typedef bool ContextType;
 
   static Error extract(BinaryStreamRef Stream, uint32_t &Len,
-                       codeview::InlineeSourceLine &Item,
-                       ContextType *Fragment);
+                       codeview::InlineeSourceLine &Item, bool HasExtraFiles);
 };
 
 namespace codeview {
@@ -74,7 +75,8 @@ private:
 
 class ModuleDebugInlineeLineFragment final : public ModuleDebugFragment {
 public:
-  explicit ModuleDebugInlineeLineFragment(bool HasExtraFiles);
+  ModuleDebugInlineeLineFragment(ModuleDebugFileChecksumFragment &Checksums,
+                                 bool HasExtraFiles);
 
   static bool classof(const ModuleDebugFragment *S) {
     return S->kind() == ModuleDebugFragmentKind::InlineeLines;
@@ -83,11 +85,12 @@ public:
   Error commit(BinaryStreamWriter &Writer) override;
   uint32_t calculateSerializedLength() override;
 
-  void addInlineSite(TypeIndex FuncId, uint32_t FileOffset,
-                     uint32_t SourceLine);
-  void addExtraFile(uint32_t FileOffset);
+  void addInlineSite(TypeIndex FuncId, StringRef FileName, uint32_t SourceLine);
+  void addExtraFile(StringRef FileName);
 
 private:
+  ModuleDebugFileChecksumFragment &Checksums;
+
   bool HasExtraFiles = false;
   uint32_t ExtraFileCount = 0;
 
diff --git a/include/llvm/DebugInfo/CodeView/ModuleDebugLineFragment.h b/include/llvm/DebugInfo/CodeView/ModuleDebugLineFragment.h
index dcfe86dd8503..3124236b8fb1 100644
--- a/include/llvm/DebugInfo/CodeView/ModuleDebugLineFragment.h
+++ b/include/llvm/DebugInfo/CodeView/ModuleDebugLineFragment.h
@@ -19,6 +19,9 @@
 namespace llvm {
 namespace codeview {
 
+class ModuleDebugFileChecksumFragment;
+class StringTable;
+
 // Corresponds to the `CV_DebugSLinesHeader_t` structure.
 struct LineFragmentHeader {
   support::ulittle32_t RelocOffset;  // Code offset of line contribution.
@@ -61,10 +64,10 @@ struct LineColumnEntry {
 
 class LineColumnExtractor {
 public:
-  typedef const LineFragmentHeader ContextType;
+  typedef const LineFragmentHeader *ContextType;
 
   static Error extract(BinaryStreamRef Stream, uint32_t &Len,
-                       LineColumnEntry &Item, const LineFragmentHeader *Header);
+                       LineColumnEntry &Item, const LineFragmentHeader *Ctx);
 };
 
 class ModuleDebugLineFragmentRef final : public ModuleDebugFragmentRef {
@@ -104,13 +107,14 @@ class ModuleDebugLineFragment final : public ModuleDebugFragment {
   };
 
 public:
-  ModuleDebugLineFragment();
+  ModuleDebugLineFragment(ModuleDebugFileChecksumFragment &Checksums,
+                          StringTable &Strings);
 
   static bool classof(const ModuleDebugFragment *S) {
     return S->kind() == ModuleDebugFragmentKind::Lines;
   }
 
-  void createBlock(uint32_t ChecksumBufferOffset);
+  void createBlock(StringRef FileName);
   void addLineInfo(uint32_t Offset, const LineInfo &Line);
   void addLineAndColumnInfo(uint32_t Offset, const LineInfo &Line,
                             uint32_t ColStart, uint32_t ColEnd);
@@ -125,6 +129,8 @@ public:
   bool hasColumnInfo() const;
 
 private:
+  ModuleDebugFileChecksumFragment &Checksums;
+
   uint16_t RelocOffset = 0;
   uint16_t RelocSegment = 0;
   uint32_t CodeSize = 0;
diff --git a/include/llvm/DebugInfo/CodeView/StringTable.h b/include/llvm/DebugInfo/CodeView/StringTable.h
new file mode 100644
index 000000000000..05dc02ee849f
--- /dev/null
+++ b/include/llvm/DebugInfo/CodeView/StringTable.h
@@ -0,0 +1,75 @@
+//===- StringTable.h - CodeView String Table Reader/Writer ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_CODEVIEW_STRINGTABLE_H
+#define LLVM_DEBUGINFO_CODEVIEW_STRINGTABLE_H
+
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+
+#include "llvm/Support/BinaryStreamRef.h"
+#include "llvm/Support/Error.h"
+
+#include <stdint.h>
+
+namespace llvm {
+
+class BinaryStreamReader;
+class BinaryStreamRef;
+class BinaryStreamWriter;
+
+namespace codeview {
+
+/// Represents a read-only view of a CodeView string table.  This is a very
+/// simple flat buffer consisting of null-terminated strings, where strings
+/// are retrieved by their offset in the buffer.  StringTableRef does not own
+/// the underlying storage for the buffer.
+class StringTableRef {
+public:
+  StringTableRef();
+
+  Error initialize(BinaryStreamRef Contents);
+
+  Expected<StringRef> getString(uint32_t Offset) const;
+
+  bool valid() const { return Stream.valid(); }
+
+private:
+  BinaryStreamRef Stream;
+};
+
+/// Represents a read-write view of a CodeView string table.  StringTable owns
+/// the underlying storage for the table, and is capable of serializing the
+/// string table into a format understood by StringTableRef.
+class StringTable {
+public:
+  // If string S does not exist in the string table, insert it.
+  // Returns the ID for S.
+  uint32_t insert(StringRef S);
+
+  // Return the ID for string S.  Assumes S exists in the table.
+  uint32_t getStringId(StringRef S) const;
+
+  uint32_t calculateSerializedSize() const;
+  Error commit(BinaryStreamWriter &Writer) const;
+
+  uint32_t size() const;
+
+  StringMap<uint32_t>::const_iterator begin() const { return Strings.begin(); }
+
+  StringMap<uint32_t>::const_iterator end() const { return Strings.end(); }
+
+private:
+  StringMap<uint32_t> Strings;
+  uint32_t StringSize = 1;
+};
+}
+}
+
+#endif
diff --git a/include/llvm/DebugInfo/CodeView/SymbolVisitorDelegate.h b/include/llvm/DebugInfo/CodeView/SymbolVisitorDelegate.h
index 2bef3f61adfc..96c8a47a3669 100644
--- a/include/llvm/DebugInfo/CodeView/SymbolVisitorDelegate.h
+++ b/include/llvm/DebugInfo/CodeView/SymbolVisitorDelegate.h
@@ -19,13 +19,15 @@ class BinaryStreamReader;
 
 namespace codeview {
 
+class StringTableRef;
+
 class SymbolVisitorDelegate {
 public:
   virtual ~SymbolVisitorDelegate() = default;
 
   virtual uint32_t getRecordOffset(BinaryStreamReader Reader) = 0;
   virtual StringRef getFileNameForFileOffset(uint32_t FileOffset) = 0;
-  virtual StringRef getStringTable() = 0;
+  virtual StringTableRef getStringTable() = 0;
 };
 
 } // end namespace codeview
diff --git a/include/llvm/DebugInfo/DWARF/DWARFContext.h b/include/llvm/DebugInfo/DWARF/DWARFContext.h
index 3c04c6716ea3..b9f3425d5deb 100644
--- a/include/llvm/DebugInfo/DWARF/DWARFContext.h
+++ b/include/llvm/DebugInfo/DWARF/DWARFContext.h
@@ -172,6 +172,9 @@ public:
     return DWOCUs[index].get();
   }
 
+  /// Get a DIE given an exact offset.
+  DWARFDie getDIEForOffset(uint32_t Offset);
+
   const DWARFUnitIndex &getCUIndex();
   DWARFGdbIndex &getGdbIndex();
   const DWARFUnitIndex &getTUIndex();
diff --git a/include/llvm/DebugInfo/DWARF/DWARFDebugLine.h b/include/llvm/DebugInfo/DWARF/DWARFDebugLine.h
index dd0e2648bf30..e21245b97b73 100644
--- a/include/llvm/DebugInfo/DWARF/DWARFDebugLine.h
+++ b/include/llvm/DebugInfo/DWARF/DWARFDebugLine.h
@@ -30,7 +30,7 @@ public:
   struct FileNameEntry {
     FileNameEntry() = default;
 
-    const char *Name = nullptr;
+    StringRef Name = StringRef();
     uint64_t DirIdx = 0;
     uint64_t ModTime = 0;
     uint64_t Length = 0;
@@ -44,6 +44,10 @@ public:
     uint64_t TotalLength;
     /// Version identifier for the statement information format.
     uint16_t Version;
+    /// In v5, size in bytes of an address (or segment offset).
+    uint8_t AddressSize;
+    /// In v5, size in bytes of a segment selector.
+    uint8_t SegSelectorSize;
     /// The number of bytes following the prologue_length field to the beginning
     /// of the first byte of the statement program itself.
     uint64_t PrologueLength;
@@ -63,7 +67,7 @@ public:
     /// The number assigned to the first special opcode.
     uint8_t OpcodeBase;
     std::vector<uint8_t> StandardOpcodeLengths;
-    std::vector<const char *> IncludeDirectories;
+    std::vector<StringRef> IncludeDirectories;
     std::vector<FileNameEntry> FileNames;
 
     bool IsDWARF64;
@@ -100,7 +104,7 @@ public:
     void postAppend();
     void reset(bool DefaultIsStmt);
     void dump(raw_ostream &OS) const;
-
+    static void dumpTableHeader(raw_ostream &OS);
     static bool orderByAddress(const Row &LHS, const Row &RHS) {
       return LHS.Address < RHS.Address;
     }
diff --git a/include/llvm/DebugInfo/DWARF/DWARFUnit.h b/include/llvm/DebugInfo/DWARF/DWARFUnit.h
index e29ba523238c..68e541bac73c 100644
--- a/include/llvm/DebugInfo/DWARF/DWARFUnit.h
+++ b/include/llvm/DebugInfo/DWARF/DWARFUnit.h
@@ -312,9 +312,9 @@ public:
         [](const DWARFDebugInfoEntry &LHS, uint32_t Offset) {
           return LHS.getOffset() < Offset;
         });
-    if (it == DieArray.end())
-      return DWARFDie();
-    return DWARFDie(this, &*it);
+    if (it != DieArray.end() && it->getOffset() == Offset)
+      return DWARFDie(this, &*it);
+    return DWARFDie();
   }
 
   uint32_t getLineTableOffset() const {
diff --git a/include/llvm/DebugInfo/DWARF/DWARFVerifier.h b/include/llvm/DebugInfo/DWARF/DWARFVerifier.h
new file mode 100644
index 000000000000..8e12bcd2c8e2
--- /dev/null
+++ b/include/llvm/DebugInfo/DWARF/DWARFVerifier.h
@@ -0,0 +1,98 @@
+//===- DWARFVerifier.h ----------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_DWARF_DWARFVERIFIER_H
+#define LLVM_DEBUGINFO_DWARF_DWARFVERIFIER_H
+
+#include <cstdint>
+#include <map>
+#include <set>
+
+namespace llvm {
+class raw_ostream;
+struct DWARFAttribute;
+class DWARFContext;
+class DWARFDie;
+class DWARFUnit;
+
+/// A class that verifies DWARF debug information given a DWARF Context.
+class DWARFVerifier {
+  raw_ostream &OS;
+  DWARFContext &DCtx;
+  /// A map that tracks all references (converted absolute references) so we
+  /// can verify each reference points to a valid DIE and not an offset that
+  /// lies between to valid DIEs.
+  std::map<uint64_t, std::set<uint32_t>> ReferenceToDIEOffsets;
+  uint32_t NumDebugInfoErrors;
+  uint32_t NumDebugLineErrors;
+
+  /// Verifies the attribute's DWARF attribute and its value.
+  ///
+  /// This function currently checks for:
+  /// - DW_AT_ranges values is a valid .debug_ranges offset
+  /// - DW_AT_stmt_list is a valid .debug_line offset
+  ///
+  /// @param Die          The DWARF DIE that owns the attribute value
+  /// @param AttrValue    The DWARF attribute value to check
+  void verifyDebugInfoAttribute(DWARFDie &Die, DWARFAttribute &AttrValue);
+
+  /// Verifies the attribute's DWARF form.
+  ///
+  /// This function currently checks for:
+  /// - All DW_FORM_ref values that are CU relative have valid CU offsets
+  /// - All DW_FORM_ref_addr values have valid .debug_info offsets
+  /// - All DW_FORM_strp values have valid .debug_str offsets
+  ///
+  /// @param Die          The DWARF DIE that owns the attribute value
+  /// @param AttrValue    The DWARF attribute value to check
+  void verifyDebugInfoForm(DWARFDie &Die, DWARFAttribute &AttrValue);
+
+  /// Verifies the all valid references that were found when iterating through
+  /// all of the DIE attributes.
+  ///
+  /// This function will verify that all references point to DIEs whose DIE
+  /// offset matches. This helps to ensure if a DWARF link phase moved things
+  /// around, that it doesn't create invalid references by failing to relocate
+  /// CU relative and absolute references.
+  void veifyDebugInfoReferences();
+
+  /// Verify the the DW_AT_stmt_list encoding and value and ensure that no
+  /// compile units that have the same DW_AT_stmt_list value.
+  void verifyDebugLineStmtOffsets();
+
+  /// Verify that all of the rows in the line table are valid.
+  ///
+  /// This function currently checks for:
+  /// - addresses within a sequence that decrease in value
+  /// - invalid file indexes
+  void verifyDebugLineRows();
+
+public:
+  DWARFVerifier(raw_ostream &S, DWARFContext &D)
+      : OS(S), DCtx(D), NumDebugInfoErrors(0), NumDebugLineErrors(0) {}
+  /// Verify the information in the .debug_info section.
+  ///
+  /// Any errors are reported to the stream that was this object was
+  /// constructed with.
+  ///
+  /// @return True if the .debug_info verifies successfully, false otherwise.
+  bool handleDebugInfo();
+
+  /// Verify the information in the .debug_line section.
+  ///
+  /// Any errors are reported to the stream that was this object was
+  /// constructed with.
+  ///
+  /// @return True if the .debug_line verifies successfully, false otherwise.
+  bool handleDebugLine();
+};
+
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_DWARF_DWARFCONTEXT_H
diff --git a/include/llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h b/include/llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h
index 879cb4285cd7..d1f791b9daed 100644
--- a/include/llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h
+++ b/include/llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h
@@ -66,7 +66,7 @@ struct ModuleInfoEx {
 template <> struct VarStreamArrayExtractor<pdb::DbiModuleDescriptor> {
   typedef void ContextType;
   static Error extract(BinaryStreamRef Stream, uint32_t &Length,
-                       pdb::DbiModuleDescriptor &Info, void *Ctx) {
+                       pdb::DbiModuleDescriptor &Info) {
     if (auto EC = pdb::DbiModuleDescriptor::initialize(Stream, Info))
       return EC;
     Length = Info.getRecordLength();
diff --git a/include/llvm/DebugInfo/PDB/Native/DbiStream.h b/include/llvm/DebugInfo/PDB/Native/DbiStream.h
index 84ae57f2e23a..08262e47f77f 100644
--- a/include/llvm/DebugInfo/PDB/Native/DbiStream.h
+++ b/include/llvm/DebugInfo/PDB/Native/DbiStream.h
@@ -13,9 +13,9 @@
 #include "llvm/DebugInfo/CodeView/ModuleDebugFragment.h"
 #include "llvm/DebugInfo/MSF/MappedBlockStream.h"
 #include "llvm/DebugInfo/PDB/Native/DbiModuleDescriptor.h"
+#include "llvm/DebugInfo/PDB/Native/PDBStringTable.h"
 #include "llvm/DebugInfo/PDB/Native/RawConstants.h"
 #include "llvm/DebugInfo/PDB/Native/RawTypes.h"
-#include "llvm/DebugInfo/PDB/Native/StringTable.h"
 #include "llvm/DebugInfo/PDB/PDBTypes.h"
 #include "llvm/Support/BinaryStreamArray.h"
 #include "llvm/Support/BinaryStreamArray.h"
@@ -91,7 +91,7 @@ private:
   std::unique_ptr<msf::MappedBlockStream> Stream;
 
   std::vector<ModuleInfoEx> ModuleInfos;
-  StringTable ECNames;
+  PDBStringTable ECNames;
 
   BinaryStreamRef ModInfoSubstream;
   BinaryStreamRef SecContrSubstream;
diff --git a/include/llvm/DebugInfo/PDB/Native/PDBFile.h b/include/llvm/DebugInfo/PDB/Native/PDBFile.h
index fbca62d6e9d9..3bed67141c56 100644
--- a/include/llvm/DebugInfo/PDB/Native/PDBFile.h
+++ b/include/llvm/DebugInfo/PDB/Native/PDBFile.h
@@ -33,7 +33,7 @@ namespace pdb {
 class DbiStream;
 class GlobalsStream;
 class InfoStream;
-class StringTable;
+class PDBStringTable;
 class PDBFileBuilder;
 class PublicsStream;
 class SymbolStream;
@@ -95,7 +95,7 @@ public:
   Expected<TpiStream &> getPDBIpiStream();
   Expected<PublicsStream &> getPDBPublicsStream();
   Expected<SymbolStream &> getPDBSymbolStream();
-  Expected<StringTable &> getStringTable();
+  Expected<PDBStringTable &> getStringTable();
 
   BumpPtrAllocator &getAllocator() { return Allocator; }
 
@@ -106,7 +106,7 @@ public:
   bool hasPDBPublicsStream();
   bool hasPDBSymbolStream();
   bool hasPDBTpiStream() const;
-  bool hasStringTable();
+  bool hasPDBStringTable();
 
 private:
   Expected<std::unique_ptr<msf::MappedBlockStream>>
@@ -131,7 +131,7 @@ private:
   std::unique_ptr<SymbolStream> Symbols;
   std::unique_ptr<msf::MappedBlockStream> DirectoryStream;
   std::unique_ptr<msf::MappedBlockStream> StringTableStream;
-  std::unique_ptr<StringTable> Strings;
+  std::unique_ptr<PDBStringTable> Strings;
 };
 }
 }
diff --git a/include/llvm/DebugInfo/PDB/Native/PDBFileBuilder.h b/include/llvm/DebugInfo/PDB/Native/PDBFileBuilder.h
index 3898af5afc9e..cd7d3b063793 100644
--- a/include/llvm/DebugInfo/PDB/Native/PDBFileBuilder.h
+++ b/include/llvm/DebugInfo/PDB/Native/PDBFileBuilder.h
@@ -15,8 +15,8 @@
 #include "llvm/ADT/Optional.h"
 #include "llvm/DebugInfo/PDB/Native/NamedStreamMap.h"
 #include "llvm/DebugInfo/PDB/Native/PDBFile.h"
+#include "llvm/DebugInfo/PDB/Native/PDBStringTableBuilder.h"
 #include "llvm/DebugInfo/PDB/Native/RawConstants.h"
-#include "llvm/DebugInfo/PDB/Native/StringTableBuilder.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Error.h"
@@ -46,12 +46,14 @@ public:
   DbiStreamBuilder &getDbiBuilder();
   TpiStreamBuilder &getTpiBuilder();
   TpiStreamBuilder &getIpiBuilder();
-  StringTableBuilder &getStringTableBuilder();
+  PDBStringTableBuilder &getStringTableBuilder();
 
   Error commit(StringRef Filename);
 
-private:
+  Expected<uint32_t> getNamedStreamIndex(StringRef Name) const;
   Error addNamedStream(StringRef Name, uint32_t Size);
+
+private:
   Expected<msf::MSFLayout> finalizeMsfLayout();
 
   BumpPtrAllocator &Allocator;
@@ -62,7 +64,7 @@ private:
   std::unique_ptr<TpiStreamBuilder> Tpi;
   std::unique_ptr<TpiStreamBuilder> Ipi;
 
-  StringTableBuilder Strings;
+  PDBStringTableBuilder Strings;
   NamedStreamMap NamedStreams;
 };
 }
diff --git a/include/llvm/DebugInfo/PDB/Native/StringTable.h b/include/llvm/DebugInfo/PDB/Native/PDBStringTable.h
index dd5e30e61827..7c7f16bd1c73 100644
--- a/include/llvm/DebugInfo/PDB/Native/StringTable.h
+++ b/include/llvm/DebugInfo/PDB/Native/PDBStringTable.h
@@ -1,4 +1,4 @@
-//===- StringTable.h - PDB String Table -------------------------*- C++ -*-===//
+//===- PDBStringTable.h - PDB String Table -----------------------*- C++-*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -7,11 +7,12 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_DEBUGINFO_PDB_RAW_STRINGTABLE_H
-#define LLVM_DEBUGINFO_PDB_RAW_STRINGTABLE_H
+#ifndef LLVM_DEBUGINFO_PDB_RAW_PDBSTRINGTABLE_H
+#define LLVM_DEBUGINFO_PDB_RAW_PDBSTRINGTABLE_H
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/DebugInfo/CodeView/StringTable.h"
 #include "llvm/Support/BinaryStreamArray.h"
 #include "llvm/Support/BinaryStreamRef.h"
 #include "llvm/Support/Endian.h"
@@ -22,31 +23,38 @@
 namespace llvm {
 class BinaryStreamReader;
 
+namespace msf {
+class MappedBlockStream;
+}
+
 namespace pdb {
 
-class StringTable {
-public:
-  StringTable();
+struct PDBStringTableHeader;
 
-  Error load(BinaryStreamReader &Stream);
+class PDBStringTable {
+public:
+  Error reload(BinaryStreamReader &Reader);
 
   uint32_t getByteSize() const;
+  uint32_t getNameCount() const;
+  uint32_t getHashVersion() const;
+  uint32_t getSignature() const;
 
-  uint32_t getNameCount() const { return NameCount; }
-  uint32_t getHashVersion() const { return HashVersion; }
-  uint32_t getSignature() const { return Signature; }
-
-  StringRef getStringForID(uint32_t ID) const;
-  uint32_t getIDForString(StringRef Str) const;
+  Expected<StringRef> getStringForID(uint32_t ID) const;
+  Expected<uint32_t> getIDForString(StringRef Str) const;
 
   FixedStreamArray<support::ulittle32_t> name_ids() const;
 
 private:
-  BinaryStreamRef NamesBuffer;
+  Error readHeader(BinaryStreamReader &Reader);
+  Error readStrings(BinaryStreamReader &Reader);
+  Error readHashTable(BinaryStreamReader &Reader);
+  Error readEpilogue(BinaryStreamReader &Reader);
+
+  const PDBStringTableHeader *Header = nullptr;
+  codeview::StringTableRef Strings;
   FixedStreamArray<support::ulittle32_t> IDs;
   uint32_t ByteSize = 0;
-  uint32_t Signature = 0;
-  uint32_t HashVersion = 0;
   uint32_t NameCount = 0;
 };
 
diff --git a/include/llvm/DebugInfo/PDB/Native/PDBStringTableBuilder.h b/include/llvm/DebugInfo/PDB/Native/PDBStringTableBuilder.h
new file mode 100644
index 000000000000..6f85e7a4a074
--- /dev/null
+++ b/include/llvm/DebugInfo/PDB/Native/PDBStringTableBuilder.h
@@ -0,0 +1,60 @@
+//===- PDBStringTableBuilder.h - PDB String Table Builder -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file creates the "/names" stream.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_PDB_RAW_PDBSTRINGTABLEBUILDER_H
+#define LLVM_DEBUGINFO_PDB_RAW_PDBSTRINGTABLEBUILDER_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/DebugInfo/CodeView/StringTable.h"
+#include "llvm/Support/Error.h"
+#include <vector>
+
+namespace llvm {
+class BinaryStreamWriter;
+class WritableBinaryStreamRef;
+
+namespace msf {
+struct MSFLayout;
+}
+
+namespace pdb {
+
+class PDBFileBuilder;
+
+class PDBStringTableBuilder {
+public:
+  // If string S does not exist in the string table, insert it.
+  // Returns the ID for S.
+  uint32_t insert(StringRef S);
+
+  uint32_t calculateSerializedSize() const;
+  Error commit(BinaryStreamWriter &Writer) const;
+
+  codeview::StringTable &getStrings() { return Strings; }
+  const codeview::StringTable &getStrings() const { return Strings; }
+
+private:
+  uint32_t calculateHashTableSize() const;
+  Error writeHeader(BinaryStreamWriter &Writer) const;
+  Error writeStrings(BinaryStreamWriter &Writer) const;
+  Error writeHashTable(BinaryStreamWriter &Writer) const;
+  Error writeEpilogue(BinaryStreamWriter &Writer) const;
+
+  codeview::StringTable Strings;
+};
+
+} // end namespace pdb
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_PDB_RAW_PDBSTRINGTABLEBUILDER_H
diff --git a/include/llvm/DebugInfo/PDB/Native/RawTypes.h b/include/llvm/DebugInfo/PDB/Native/RawTypes.h
index e1c6cf0021d5..93622d0a4394 100644
--- a/include/llvm/DebugInfo/PDB/Native/RawTypes.h
+++ b/include/llvm/DebugInfo/PDB/Native/RawTypes.h
@@ -307,13 +307,13 @@ struct InfoStreamHeader {
 };
 
 /// The header preceeding the /names stream.
-struct StringTableHeader {
-  support::ulittle32_t Signature;
-  support::ulittle32_t HashVersion;
-  support::ulittle32_t ByteSize;
+struct PDBStringTableHeader {
+  support::ulittle32_t Signature;   // PDBStringTableSignature
+  support::ulittle32_t HashVersion; // 1 or 2
+  support::ulittle32_t ByteSize;    // Number of bytes of names buffer.
 };
 
-const uint32_t StringTableSignature = 0xEFFEEFFE;
+const uint32_t PDBStringTableSignature = 0xEFFEEFFE;
 
 } // namespace pdb
 } // namespace llvm
diff --git a/include/llvm/DebugInfo/PDB/Native/StringTableBuilder.h b/include/llvm/DebugInfo/PDB/Native/StringTableBuilder.h
deleted file mode 100644
index 9c4b12e33ba0..000000000000
--- a/include/llvm/DebugInfo/PDB/Native/StringTableBuilder.h
+++ /dev/null
@@ -1,45 +0,0 @@
-//===- StringTableBuilder.h - PDB String Table Builder ----------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file creates the "/names" stream.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_DEBUGINFO_PDB_RAW_STRINGTABLEBUILDER_H
-#define LLVM_DEBUGINFO_PDB_RAW_STRINGTABLEBUILDER_H
-
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/Support/Error.h"
-#include <vector>
-
-namespace llvm {
-class BinaryStreamWriter;
-
-namespace pdb {
-
-class StringTableBuilder {
-public:
-  // If string S does not exist in the string table, insert it.
-  // Returns the ID for S.
-  uint32_t insert(StringRef S);
-  uint32_t getStringIndex(StringRef S);
-
-  uint32_t finalize();
-  Error commit(BinaryStreamWriter &Writer) const;
-
-private:
-  DenseMap<StringRef, uint32_t> Strings;
-  uint32_t StringSize = 1;
-};
-
-} // end namespace pdb
-} // end namespace llvm
-
-#endif // LLVM_DEBUGINFO_PDB_RAW_STRINGTABLEBUILDER_H
diff --git a/include/llvm/IR/Attributes.h b/include/llvm/IR/Attributes.h
index af46034d5a9e..adcb7266073b 100644
--- a/include/llvm/IR/Attributes.h
+++ b/include/llvm/IR/Attributes.h
@@ -285,7 +285,8 @@ class AttributeList {
 public:
   enum AttrIndex : unsigned {
     ReturnIndex = 0U,
-    FunctionIndex = ~0U
+    FunctionIndex = ~0U,
+    FirstArgIndex = 1,
   };
 
 private:
@@ -336,6 +337,13 @@ public:
   static AttributeList get(LLVMContext &C, unsigned Index,
                            const AttrBuilder &B);
 
+  /// Add an argument attribute to the list. Returns a new list because
+  /// attribute lists are immutable.
+  AttributeList addParamAttribute(LLVMContext &C, unsigned ArgNo,
+                                  Attribute::AttrKind Kind) const {
+    return addAttribute(C, ArgNo + FirstArgIndex, Kind);
+  }
+
   /// \brief Add an attribute to the attribute set at the given index. Because
   /// attribute sets are immutable, this returns a new set.
   AttributeList addAttribute(LLVMContext &C, unsigned Index,
@@ -354,9 +362,6 @@ public:
   /// \brief Add attributes to the attribute set at the given index. Because
   /// attribute sets are immutable, this returns a new set.
   AttributeList addAttributes(LLVMContext &C, unsigned Index,
-                              AttributeList Attrs) const;
-
-  AttributeList addAttributes(LLVMContext &C, unsigned Index,
                               const AttrBuilder &B) const;
 
   /// \brief Remove the specified attribute at the specified index from this
@@ -375,13 +380,7 @@ public:
   /// attribute list. Because attribute lists are immutable, this returns the
   /// new list.
   AttributeList removeAttributes(LLVMContext &C, unsigned Index,
-                                 AttributeList Attrs) const;
-
-  /// \brief Remove the specified attributes at the specified index from this
-  /// attribute list. Because attribute lists are immutable, this returns the
-  /// new list.
-  AttributeList removeAttributes(LLVMContext &C, unsigned Index,
-                                 const AttrBuilder &Attrs) const;
+                                 const AttrBuilder &AttrsToRemove) const;
 
   /// \brief Remove all attributes at the specified index from this
   /// attribute list. Because attribute lists are immutable, this returns the
@@ -442,7 +441,7 @@ public:
   /// may be faster.
   bool hasFnAttribute(StringRef Kind) const;
 
-  /// \brief Equivalent to hasAttribute(ArgNo + 1, Kind).
+  /// \brief Equivalent to hasAttribute(ArgNo + FirstArgIndex, Kind).
   bool hasParamAttribute(unsigned ArgNo, Attribute::AttrKind Kind) const;
 
   /// \brief Return true if the specified attribute is set for at least one
diff --git a/include/llvm/IR/CallSite.h b/include/llvm/IR/CallSite.h
index bad1d4e383d5..d61431a51a97 100644
--- a/include/llvm/IR/CallSite.h
+++ b/include/llvm/IR/CallSite.h
@@ -339,6 +339,10 @@ public:
     CALLSITE_DELEGATE_SETTER(addAttribute(i, Attr));
   }
 
+  void addParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
+    CALLSITE_DELEGATE_SETTER(addParamAttr(ArgNo, Kind));
+  }
+
   void removeAttribute(unsigned i, Attribute::AttrKind Kind) {
     CALLSITE_DELEGATE_SETTER(removeAttribute(i, Kind));
   }
@@ -347,6 +351,10 @@ public:
     CALLSITE_DELEGATE_SETTER(removeAttribute(i, Kind));
   }
 
+  void removeParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
+    CALLSITE_DELEGATE_SETTER(removeParamAttr(ArgNo, Kind));
+  }
+
   /// Return true if this function has the given attribute.
   bool hasFnAttr(Attribute::AttrKind Kind) const {
     CALLSITE_DELEGATE_GETTER(hasFnAttr(Kind));
@@ -408,11 +416,9 @@ public:
     CALLSITE_DELEGATE_GETTER(getDereferenceableOrNullBytes(i));
   }
 
-  /// Determine if the parameter or return value is marked with NoAlias
-  /// attribute.
-  /// @param n The parameter to check. 1 is the first parameter, 0 is the return
-  bool doesNotAlias(unsigned n) const {
-    CALLSITE_DELEGATE_GETTER(doesNotAlias(n));
+  /// Determine if the return value is marked with NoAlias attribute.
+  bool returnDoesNotAlias() const {
+    CALLSITE_DELEGATE_GETTER(returnDoesNotAlias());
   }
 
   /// Return true if the call should not be treated as a call to a builtin.
diff --git a/include/llvm/IR/Function.h b/include/llvm/IR/Function.h
index 9e723f977755..f9582f51ca8d 100644
--- a/include/llvm/IR/Function.h
+++ b/include/llvm/IR/Function.h
@@ -204,6 +204,10 @@ public:
     addAttribute(AttributeList::FunctionIndex, Attr);
   }
 
+  void addParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
+    addAttribute(ArgNo + AttributeList::FirstArgIndex, Kind);
+  }
+
   /// @brief Remove function attributes from this function.
   void removeFnAttr(Attribute::AttrKind Kind) {
     removeAttribute(AttributeList::FunctionIndex, Kind);
@@ -211,10 +215,14 @@ public:
 
   /// @brief Remove function attribute from this function.
   void removeFnAttr(StringRef Kind) {
-    setAttributes(AttributeSets.removeAttribute(
+    setAttributes(getAttributes().removeAttribute(
         getContext(), AttributeList::FunctionIndex, Kind));
   }
 
+  void removeParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
+    removeAttribute(ArgNo + AttributeList::FirstArgIndex, Kind);
+  }
+
   /// \brief Set the entry count for this function.
   ///
   /// Entry count is the number of times this function was executed based on
@@ -279,7 +287,7 @@ public:
   void addAttribute(unsigned i, Attribute Attr);
 
   /// @brief adds the attributes to the list of attributes.
-  void addAttributes(unsigned i, AttributeList Attrs);
+  void addAttributes(unsigned i, const AttrBuilder &Attrs);
 
   /// @brief removes the attribute from the list of attributes.
   void removeAttribute(unsigned i, Attribute::AttrKind Kind);
@@ -288,7 +296,7 @@ public:
   void removeAttribute(unsigned i, StringRef Kind);
 
   /// @brief removes the attributes from the list of attributes.
-  void removeAttributes(unsigned i, AttributeList Attrs);
+  void removeAttributes(unsigned i, const AttrBuilder &Attrs);
 
   /// @brief check if an attributes is in the list of attributes.
   bool hasAttribute(unsigned i, Attribute::AttrKind Kind) const {
@@ -459,35 +467,12 @@ public:
   /// @brief Determine if the parameter or return value is marked with NoAlias
   /// attribute.
   /// @param n The parameter to check. 1 is the first parameter, 0 is the return
-  bool doesNotAlias(unsigned n) const {
-    return AttributeSets.hasAttribute(n, Attribute::NoAlias);
-  }
-  void setDoesNotAlias(unsigned n) {
-    addAttribute(n, Attribute::NoAlias);
-  }
-
-  /// @brief Determine if the parameter can be captured.
-  /// @param n The parameter to check. 1 is the first parameter, 0 is the return
-  bool doesNotCapture(unsigned n) const {
-    return AttributeSets.hasAttribute(n, Attribute::NoCapture);
-  }
-  void setDoesNotCapture(unsigned n) {
-    addAttribute(n, Attribute::NoCapture);
-  }
-
-  bool doesNotAccessMemory(unsigned n) const {
-    return AttributeSets.hasAttribute(n, Attribute::ReadNone);
-  }
-  void setDoesNotAccessMemory(unsigned n) {
-    addAttribute(n, Attribute::ReadNone);
-  }
-
-  bool onlyReadsMemory(unsigned n) const {
-    return doesNotAccessMemory(n) ||
-      AttributeSets.hasAttribute(n, Attribute::ReadOnly);
+  bool returnDoesNotAlias() const {
+    return AttributeSets.hasAttribute(AttributeList::ReturnIndex,
+                                      Attribute::NoAlias);
   }
-  void setOnlyReadsMemory(unsigned n) {
-    addAttribute(n, Attribute::ReadOnly);
+  void setReturnDoesNotAlias() {
+    addAttribute(AttributeList::ReturnIndex, Attribute::NoAlias);
   }
 
   /// Optimize this function for minimum size (-Oz).
diff --git a/include/llvm/IR/Instructions.h b/include/llvm/IR/Instructions.h
index 4d3f1dc267f2..844a7273eca9 100644
--- a/include/llvm/IR/Instructions.h
+++ b/include/llvm/IR/Instructions.h
@@ -1658,12 +1658,18 @@ public:
   /// adds the attribute to the list of attributes.
   void addAttribute(unsigned i, Attribute Attr);
 
+  /// Adds the attribute to the indicated argument
+  void addParamAttr(unsigned ArgNo, Attribute::AttrKind Kind);
+
   /// removes the attribute from the list of attributes.
   void removeAttribute(unsigned i, Attribute::AttrKind Kind);
 
   /// removes the attribute from the list of attributes.
   void removeAttribute(unsigned i, StringRef Kind);
 
+  /// Removes the attribute from the given argument
+  void removeParamAttr(unsigned ArgNo, Attribute::AttrKind Kind);
+
   /// adds the dereferenceable attribute to the list of attributes.
   void addDereferenceableAttr(unsigned i, uint64_t Bytes);
 
@@ -1734,11 +1740,9 @@ public:
     return Attrs.getDereferenceableOrNullBytes(i);
   }
 
-  /// @brief Determine if the parameter or return value is marked with NoAlias
-  /// attribute.
-  /// @param n The parameter to check. 1 is the first parameter, 0 is the return
-  bool doesNotAlias(unsigned n) const {
-    return Attrs.hasAttribute(n, Attribute::NoAlias);
+  /// @brief Determine if the return value is marked with NoAlias attribute.
+  bool returnDoesNotAlias() const {
+    return Attrs.hasAttribute(AttributeList::ReturnIndex, Attribute::NoAlias);
   }
 
   /// Return true if the call should not be treated as a call to a
@@ -3750,12 +3754,18 @@ public:
   /// adds the attribute to the list of attributes.
   void addAttribute(unsigned i, Attribute Attr);
 
+  /// Adds the attribute to the indicated argument
+  void addParamAttr(unsigned ArgNo, Attribute::AttrKind Kind);
+
   /// removes the attribute from the list of attributes.
   void removeAttribute(unsigned i, Attribute::AttrKind Kind);
 
   /// removes the attribute from the list of attributes.
   void removeAttribute(unsigned i, StringRef Kind);
 
+  /// Removes the attribute from the given argument
+  void removeParamAttr(unsigned ArgNo, Attribute::AttrKind Kind);
+
   /// adds the dereferenceable attribute to the list of attributes.
   void addDereferenceableAttr(unsigned i, uint64_t Bytes);
 
@@ -3827,11 +3837,9 @@ public:
     return Attrs.getDereferenceableOrNullBytes(i);
   }
 
-  /// @brief Determine if the parameter or return value is marked with NoAlias
-  /// attribute.
-  /// @param n The parameter to check. 1 is the first parameter, 0 is the return
-  bool doesNotAlias(unsigned n) const {
-    return Attrs.hasAttribute(n, Attribute::NoAlias);
+  /// @brief Determine if the return value is marked with NoAlias attribute.
+  bool returnDoesNotAlias() const {
+    return Attrs.hasAttribute(AttributeList::ReturnIndex, Attribute::NoAlias);
   }
 
   /// Return true if the call should not be treated as a call to a
diff --git a/include/llvm/IR/Intrinsics.h b/include/llvm/IR/Intrinsics.h
index 2f6bdf8ecf19..fc79da7ae0e6 100644
--- a/include/llvm/IR/Intrinsics.h
+++ b/include/llvm/IR/Intrinsics.h
@@ -100,7 +100,7 @@ namespace Intrinsic {
       Void, VarArg, MMX, Token, Metadata, Half, Float, Double,
       Integer, Vector, Pointer, Struct,
       Argument, ExtendArgument, TruncArgument, HalfVecArgument,
-      SameVecWidthArgument, PtrToArgument, PtrToElt, VecOfPtrsToElt
+      SameVecWidthArgument, PtrToArgument, PtrToElt, VecOfAnyPtrsToElt
     } Kind;
 
     union {
@@ -119,25 +119,43 @@ namespace Intrinsic {
       AK_AnyVector,
       AK_AnyPointer
     };
+
     unsigned getArgumentNumber() const {
       assert(Kind == Argument || Kind == ExtendArgument ||
              Kind == TruncArgument || Kind == HalfVecArgument ||
              Kind == SameVecWidthArgument || Kind == PtrToArgument ||
-             Kind == PtrToElt || Kind == VecOfPtrsToElt);
+             Kind == PtrToElt);
       return Argument_Info >> 3;
     }
     ArgKind getArgumentKind() const {
       assert(Kind == Argument || Kind == ExtendArgument ||
              Kind == TruncArgument || Kind == HalfVecArgument ||
-             Kind == SameVecWidthArgument || Kind == PtrToArgument ||
-             Kind == VecOfPtrsToElt);
+             Kind == SameVecWidthArgument || Kind == PtrToArgument);
       return (ArgKind)(Argument_Info & 7);
     }
 
+    // VecOfAnyPtrsToElt uses both an overloaded argument (for address space)
+    // and a reference argument (for matching vector width and element types)
+    unsigned getOverloadArgNumber() const {
+      assert(Kind == VecOfAnyPtrsToElt);
+      return Argument_Info >> 16;
+    }
+    unsigned getRefArgNumber() const {
+      assert(Kind == VecOfAnyPtrsToElt);
+      return Argument_Info & 0xFFFF;
+    }
+
     static IITDescriptor get(IITDescriptorKind K, unsigned Field) {
       IITDescriptor Result = { K, { Field } };
       return Result;
     }
+
+    static IITDescriptor get(IITDescriptorKind K, unsigned short Hi,
+                             unsigned short Lo) {
+      unsigned Field = Hi << 16 | Lo;
+      IITDescriptor Result = {K, {Field}};
+      return Result;
+    }
   };
 
   /// Return the IIT table descriptor for the specified intrinsic into an array
diff --git a/include/llvm/IR/Intrinsics.td b/include/llvm/IR/Intrinsics.td
index 39b992cd06a8..cf7e5d8758a9 100644
--- a/include/llvm/IR/Intrinsics.td
+++ b/include/llvm/IR/Intrinsics.td
@@ -155,7 +155,7 @@ class LLVMVectorSameWidth<int num, LLVMType elty>
 }
 class LLVMPointerTo<int num> : LLVMMatchType<num>;
 class LLVMPointerToElt<int num> : LLVMMatchType<num>;
-class LLVMVectorOfPointersToElt<int num> : LLVMMatchType<num>;
+class LLVMVectorOfAnyPointersToElt<int num> : LLVMMatchType<num>;
 
 // Match the type of another intrinsic parameter that is expected to be a
 // vector type, but change the element count to be half as many
@@ -404,7 +404,7 @@ def int_memset  : Intrinsic<[],
 // FIXME: Add version of these floating point intrinsics which allow non-default
 // rounding modes and FP exception handling.
 
-let IntrProperties = [IntrNoMem] in {
+let IntrProperties = [IntrNoMem, IntrSpeculatable] in {
   def int_fma  : Intrinsic<[llvm_anyfloat_ty],
                            [LLVMMatchType<0>, LLVMMatchType<0>,
                             LLVMMatchType<0>]>;
@@ -440,10 +440,12 @@ let IntrProperties = [IntrNoMem] in {
 }
 
 def int_minnum : Intrinsic<[llvm_anyfloat_ty],
-  [LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem, Commutative]
+  [LLVMMatchType<0>, LLVMMatchType<0>],
+  [IntrNoMem, IntrSpeculatable, Commutative]
 >;
 def int_maxnum : Intrinsic<[llvm_anyfloat_ty],
-  [LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem, Commutative]
+  [LLVMMatchType<0>, LLVMMatchType<0>],
+  [IntrNoMem, IntrSpeculatable, Commutative]
 >;
 
 // NOTE: these are internal interfaces.
@@ -455,7 +457,7 @@ def int_siglongjmp : Intrinsic<[], [llvm_ptr_ty, llvm_i32_ty], [IntrNoReturn]>;
 // Internal interface for object size checking
 def int_objectsize : Intrinsic<[llvm_anyint_ty],
                                [llvm_anyptr_ty, llvm_i1_ty, llvm_i1_ty],
-                               [IntrNoMem]>,
+                               [IntrNoMem, IntrSpeculatable]>,
                                GCCBuiltin<"__builtin_object_size">;
 
 //===--------------- Constrained Floating Point Intrinsics ----------------===//
@@ -500,7 +502,7 @@ def int_expect : Intrinsic<[llvm_anyint_ty], [LLVMMatchType<0>,
 //
 
 // None of these intrinsics accesses memory at all.
-let IntrProperties = [IntrNoMem] in {
+let IntrProperties = [IntrNoMem, IntrSpeculatable] in {
   def int_bswap: Intrinsic<[llvm_anyint_ty], [LLVMMatchType<0>]>;
   def int_ctpop: Intrinsic<[llvm_anyint_ty], [LLVMMatchType<0>]>;
   def int_ctlz : Intrinsic<[llvm_anyint_ty], [LLVMMatchType<0>, llvm_i1_ty]>;
@@ -511,10 +513,11 @@ let IntrProperties = [IntrNoMem] in {
 //===------------------------ Debugger Intrinsics -------------------------===//
 //
 
-// None of these intrinsics accesses memory at all...but that doesn't mean the
-// optimizers can change them aggressively.  Special handling needed in a few
-// places.
-let IntrProperties = [IntrNoMem] in {
+// None of these intrinsics accesses memory at all...but that doesn't
+// mean the optimizers can change them aggressively.  Special handling
+// needed in a few places. These synthetic intrinsics have no
+// side-effects and just mark information about their operands.
+let IntrProperties = [IntrNoMem, IntrSpeculatable] in {
   def int_dbg_declare      : Intrinsic<[],
                                        [llvm_metadata_ty,
                                        llvm_metadata_ty,
@@ -592,24 +595,24 @@ def int_adjust_trampoline : Intrinsic<[llvm_ptr_ty], [llvm_ptr_ty],
 // Expose the carry flag from add operations on two integrals.
 def int_sadd_with_overflow : Intrinsic<[llvm_anyint_ty, llvm_i1_ty],
                                        [LLVMMatchType<0>, LLVMMatchType<0>],
-                                       [IntrNoMem]>;
+                                       [IntrNoMem, IntrSpeculatable]>;
 def int_uadd_with_overflow : Intrinsic<[llvm_anyint_ty, llvm_i1_ty],
                                        [LLVMMatchType<0>, LLVMMatchType<0>],
-                                       [IntrNoMem]>;
+                                       [IntrNoMem, IntrSpeculatable]>;
 
 def int_ssub_with_overflow : Intrinsic<[llvm_anyint_ty, llvm_i1_ty],
                                        [LLVMMatchType<0>, LLVMMatchType<0>],
-                                       [IntrNoMem]>;
+                                       [IntrNoMem, IntrSpeculatable]>;
 def int_usub_with_overflow : Intrinsic<[llvm_anyint_ty, llvm_i1_ty],
                                        [LLVMMatchType<0>, LLVMMatchType<0>],
-                                       [IntrNoMem]>;
+                                       [IntrNoMem, IntrSpeculatable]>;
 
 def int_smul_with_overflow : Intrinsic<[llvm_anyint_ty, llvm_i1_ty],
                                        [LLVMMatchType<0>, LLVMMatchType<0>],
-                                       [IntrNoMem]>;
+                                       [IntrNoMem, IntrSpeculatable]>;
 def int_umul_with_overflow : Intrinsic<[llvm_anyint_ty, llvm_i1_ty],
                                        [LLVMMatchType<0>, LLVMMatchType<0>],
-                                       [IntrNoMem]>;
+                                       [IntrNoMem, IntrSpeculatable]>;
 
 //===------------------------- Memory Use Markers -------------------------===//
 //
@@ -633,7 +636,7 @@ def int_invariant_end   : Intrinsic<[],
 // it can be CSE only if memory didn't change between 2 barriers call,
 // which is valid.
 // The argument also can't be marked with 'returned' attribute, because
-// it would remove barrier. 
+// it would remove barrier.
 def int_invariant_group_barrier : Intrinsic<[llvm_ptr_ty],
                                             [llvm_ptr_ty],
                                             [IntrReadMem, IntrArgMemOnly]>;
@@ -758,14 +761,14 @@ def int_masked_load  : Intrinsic<[llvm_anyvector_ty],
                                  [IntrReadMem, IntrArgMemOnly]>;
 
 def int_masked_gather: Intrinsic<[llvm_anyvector_ty],
-                                 [LLVMVectorOfPointersToElt<0>, llvm_i32_ty,
+                                 [LLVMVectorOfAnyPointersToElt<0>, llvm_i32_ty,
                                   LLVMVectorSameWidth<0, llvm_i1_ty>,
                                   LLVMMatchType<0>],
                                  [IntrReadMem]>;
 
 def int_masked_scatter: Intrinsic<[],
                                   [llvm_anyvector_ty,
-                                   LLVMVectorOfPointersToElt<0>, llvm_i32_ty,
+                                   LLVMVectorOfAnyPointersToElt<0>, llvm_i32_ty,
                                    LLVMVectorSameWidth<0, llvm_i1_ty>]>;
 
 def int_masked_expandload: Intrinsic<[llvm_anyvector_ty],
diff --git a/include/llvm/IR/IntrinsicsX86.td b/include/llvm/IR/IntrinsicsX86.td
index 97c756cf4b60..1c466e73eb1b 100644
--- a/include/llvm/IR/IntrinsicsX86.td
+++ b/include/llvm/IR/IntrinsicsX86.td
@@ -3221,6 +3221,29 @@ let TargetPrefix = "x86" in {  // All intrinsics start with "llvm.x86.".
 }
 
 //===----------------------------------------------------------------------===//
+// LWP
+let TargetPrefix = "x86" in {  // All intrinsics start with "llvm.x86.".
+  def int_x86_llwpcb :
+              GCCBuiltin<"__builtin_ia32_llwpcb">,
+              Intrinsic<[], [llvm_ptr_ty], []>;
+  def int_x86_slwpcb :
+              GCCBuiltin<"__builtin_ia32_slwpcb">,
+              Intrinsic<[llvm_ptr_ty], [], []>;
+  def int_x86_lwpins32 :
+              GCCBuiltin<"__builtin_ia32_lwpins32">,
+              Intrinsic<[llvm_i8_ty], [llvm_i32_ty, llvm_i32_ty, llvm_i32_ty], []>;
+  def int_x86_lwpins64 :
+              GCCBuiltin<"__builtin_ia32_lwpins64">,
+              Intrinsic<[llvm_i8_ty], [llvm_i64_ty, llvm_i32_ty, llvm_i32_ty], []>;
+  def int_x86_lwpval32 :
+              GCCBuiltin<"__builtin_ia32_lwpval32">,
+              Intrinsic<[], [llvm_i32_ty, llvm_i32_ty, llvm_i32_ty], []>;
+  def int_x86_lwpval64 :
+              GCCBuiltin<"__builtin_ia32_lwpval64">,
+              Intrinsic<[], [llvm_i64_ty, llvm_i32_ty, llvm_i32_ty], []>;
+}
+
+//===----------------------------------------------------------------------===//
 // MMX
 
 // Empty MMX state op.
diff --git a/include/llvm/Support/BinaryStreamArray.h b/include/llvm/Support/BinaryStreamArray.h
index 748a62be231e..f141c30f16c7 100644
--- a/include/llvm/Support/BinaryStreamArray.h
+++ b/include/llvm/Support/BinaryStreamArray.h
@@ -42,99 +42,34 @@ namespace llvm {
 /// having to specify a second template argument to VarStreamArray (documented
 /// below).
 template <typename T> struct VarStreamArrayExtractor {
-  typedef void Context;
+  struct ContextType {};
 
   // Method intentionally deleted.  You must provide an explicit specialization
-  // with the following method implemented.
-  static Error extract(BinaryStreamRef Stream, uint32_t &Len, T &Item,
-                       Context *Ctx) = delete;
-};
-
-/// VarStreamArray represents an array of variable length records backed by a
-/// stream.  This could be a contiguous sequence of bytes in memory, it could
-/// be a file on disk, or it could be a PDB stream where bytes are stored as
-/// discontiguous blocks in a file.  Usually it is desirable to treat arrays
-/// as contiguous blocks of memory, but doing so with large PDB files, for
-/// example, could mean allocating huge amounts of memory just to allow
-/// re-ordering of stream data to be contiguous before iterating over it.  By
-/// abstracting this out, we need not duplicate this memory, and we can
-/// iterate over arrays in arbitrarily formatted streams.  Elements are parsed
-/// lazily on iteration, so there is no upfront cost associated with building
-/// or copying a VarStreamArray, no matter how large it may be.
-///
-/// You create a VarStreamArray by specifying a ValueType and an Extractor type.
-/// If you do not specify an Extractor type, you are expected to specialize
-/// VarStreamArrayExtractor<T> for your ValueType.
-///
-/// The default extractor type is stateless, but by specializing
-/// VarStreamArrayExtractor or defining your own custom extractor type and
-/// adding the appropriate ContextType typedef to the class, you can pass a
-/// context field during construction of the VarStreamArray that will be
-/// passed to each call to extract.
-///
-template <typename ValueType, typename ExtractorType>
-class VarStreamArrayIterator;
-
-template <typename ValueType,
-          typename ExtractorType = VarStreamArrayExtractor<ValueType>>
-class VarStreamArray {
-public:
-  typedef typename ExtractorType::ContextType ContextType;
-  typedef VarStreamArrayIterator<ValueType, ExtractorType> Iterator;
-  friend Iterator;
-
-  VarStreamArray() = default;
-
-  explicit VarStreamArray(BinaryStreamRef Stream,
-                          ContextType *Context = nullptr)
-      : Stream(Stream), Context(Context) {}
-
-  VarStreamArray(const VarStreamArray<ValueType, ExtractorType> &Other)
-      : Stream(Other.Stream), Context(Other.Context) {}
-
-  Iterator begin(bool *HadError = nullptr) const {
-    if (empty())
-      return end();
-
-    return Iterator(*this, Context, HadError);
-  }
-
-  Iterator end() const { return Iterator(); }
-
-  bool empty() const { return Stream.getLength() == 0; }
-
-  /// \brief given an offset into the array's underlying stream, return an
-  /// iterator to the record at that offset.  This is considered unsafe
-  /// since the behavior is undefined if \p Offset does not refer to the
-  /// beginning of a valid record.
-  Iterator at(uint32_t Offset) const {
-    return Iterator(*this, Context, Stream.drop_front(Offset), nullptr);
-  }
-
-  BinaryStreamRef getUnderlyingStream() const { return Stream; }
+  // with one of the following two methods implemented.
+  static Error extract(BinaryStreamRef Stream, uint32_t &Len, T &Item) = delete;
 
-private:
-  BinaryStreamRef Stream;
-  ContextType *Context = nullptr;
+  static Error extract(BinaryStreamRef Stream, uint32_t &Len, T &Item,
+                       const ContextType &Ctx) = delete;
 };
 
-template <typename ValueType, typename ExtractorType>
+template <typename ArrayType, typename Value, typename Extractor,
+          typename WrappedCtx>
 class VarStreamArrayIterator
     : public iterator_facade_base<
-          VarStreamArrayIterator<ValueType, ExtractorType>,
-          std::forward_iterator_tag, ValueType> {
-  typedef typename ExtractorType::ContextType ContextType;
-  typedef VarStreamArrayIterator<ValueType, ExtractorType> IterType;
-  typedef VarStreamArray<ValueType, ExtractorType> ArrayType;
+          VarStreamArrayIterator<ArrayType, Value, Extractor, WrappedCtx>,
+          std::forward_iterator_tag, Value> {
+  typedef VarStreamArrayIterator<ArrayType, Value, Extractor, WrappedCtx>
+      IterType;
 
 public:
-  VarStreamArrayIterator(const ArrayType &Array, ContextType *Context,
+  VarStreamArrayIterator() = default;
+  VarStreamArrayIterator(const ArrayType &Array, const WrappedCtx &Ctx,
                          BinaryStreamRef Stream, bool *HadError = nullptr)
-      : IterRef(Stream), Context(Context), Array(&Array), HadError(HadError) {
+      : IterRef(Stream), Ctx(&Ctx), Array(&Array), HadError(HadError) {
     if (IterRef.getLength() == 0)
       moveToEnd();
     else {
-      auto EC = ExtractorType::extract(IterRef, ThisLen, ThisValue, Context);
+      auto EC = Ctx.template invoke<Extractor>(IterRef, ThisLen, ThisValue);
       if (EC) {
         consumeError(std::move(EC));
         markError();
@@ -142,11 +77,13 @@ public:
     }
   }
 
-  VarStreamArrayIterator(const ArrayType &Array, ContextType *Context,
+  VarStreamArrayIterator(const ArrayType &Array, const WrappedCtx &Ctx,
                          bool *HadError = nullptr)
-      : VarStreamArrayIterator(Array, Context, Array.Stream, HadError) {}
+      : VarStreamArrayIterator(Array, Ctx, Array.Stream, HadError) {}
+
+  VarStreamArrayIterator(const WrappedCtx &Ctx) : Ctx(&Ctx) {}
+  VarStreamArrayIterator(const VarStreamArrayIterator &Other) = default;
 
-  VarStreamArrayIterator() = default;
   ~VarStreamArrayIterator() = default;
 
   bool operator==(const IterType &R) const {
@@ -164,12 +101,12 @@ public:
     return false;
   }
 
-  const ValueType &operator*() const {
+  const Value &operator*() const {
     assert(Array && !HasError);
     return ThisValue;
   }
 
-  ValueType &operator*() {
+  Value &operator*() {
     assert(Array && !HasError);
     return ThisValue;
   }
@@ -185,7 +122,7 @@ public:
         moveToEnd();
       } else {
         // There is some data after the current record.
-        auto EC = ExtractorType::extract(IterRef, ThisLen, ThisValue, Context);
+        auto EC = Ctx->template invoke<Extractor>(IterRef, ThisLen, ThisValue);
         if (EC) {
           consumeError(std::move(EC));
           markError();
@@ -210,15 +147,136 @@ private:
       *HadError = true;
   }
 
-  ValueType ThisValue;
+  Value ThisValue;
   BinaryStreamRef IterRef;
-  ContextType *Context{nullptr};
+  const WrappedCtx *Ctx{nullptr};
   const ArrayType *Array{nullptr};
   uint32_t ThisLen{0};
   bool HasError{false};
   bool *HadError{nullptr};
 };
 
+template <typename T, typename Context> struct ContextWrapper {
+  ContextWrapper() = default;
+
+  explicit ContextWrapper(Context &&Ctx) : Ctx(Ctx) {}
+
+  template <typename Extractor>
+  Error invoke(BinaryStreamRef Stream, uint32_t &Len, T &Item) const {
+    return Extractor::extract(Stream, Len, Item, Ctx);
+  }
+
+  Context Ctx;
+};
+
+template <typename T> struct ContextWrapper<T, void> {
+  ContextWrapper() = default;
+
+  template <typename Extractor>
+  Error invoke(BinaryStreamRef Stream, uint32_t &Len, T &Item) const {
+    return Extractor::extract(Stream, Len, Item);
+  }
+};
+
+/// VarStreamArray represents an array of variable length records backed by a
+/// stream.  This could be a contiguous sequence of bytes in memory, it could
+/// be a file on disk, or it could be a PDB stream where bytes are stored as
+/// discontiguous blocks in a file.  Usually it is desirable to treat arrays
+/// as contiguous blocks of memory, but doing so with large PDB files, for
+/// example, could mean allocating huge amounts of memory just to allow
+/// re-ordering of stream data to be contiguous before iterating over it.  By
+/// abstracting this out, we need not duplicate this memory, and we can
+/// iterate over arrays in arbitrarily formatted streams.  Elements are parsed
+/// lazily on iteration, so there is no upfront cost associated with building
+/// or copying a VarStreamArray, no matter how large it may be.
+///
+/// You create a VarStreamArray by specifying a ValueType and an Extractor type.
+/// If you do not specify an Extractor type, you are expected to specialize
+/// VarStreamArrayExtractor<T> for your ValueType.
+///
+/// The default extractor type is stateless, but by specializing
+/// VarStreamArrayExtractor or defining your own custom extractor type and
+/// adding the appropriate ContextType typedef to the class, you can pass a
+/// context field during construction of the VarStreamArray that will be
+/// passed to each call to extract.
+///
+template <typename Value, typename Extractor, typename WrappedCtx>
+class VarStreamArrayBase {
+  typedef VarStreamArrayBase<Value, Extractor, WrappedCtx> MyType;
+
+public:
+  typedef VarStreamArrayIterator<MyType, Value, Extractor, WrappedCtx> Iterator;
+  friend Iterator;
+
+  VarStreamArrayBase() = default;
+
+  VarStreamArrayBase(BinaryStreamRef Stream, const WrappedCtx &Ctx)
+      : Stream(Stream), Ctx(Ctx) {}
+
+  VarStreamArrayBase(const MyType &Other)
+      : Stream(Other.Stream), Ctx(Other.Ctx) {}
+
+  Iterator begin(bool *HadError = nullptr) const {
+    if (empty())
+      return end();
+
+    return Iterator(*this, Ctx, Stream, HadError);
+  }
+
+  bool valid() const { return Stream.valid(); }
+
+  Iterator end() const { return Iterator(Ctx); }
+
+  bool empty() const { return Stream.getLength() == 0; }
+
+  /// \brief given an offset into the array's underlying stream, return an
+  /// iterator to the record at that offset.  This is considered unsafe
+  /// since the behavior is undefined if \p Offset does not refer to the
+  /// beginning of a valid record.
+  Iterator at(uint32_t Offset) const {
+    return Iterator(*this, Ctx, Stream.drop_front(Offset), nullptr);
+  }
+
+  BinaryStreamRef getUnderlyingStream() const { return Stream; }
+
+private:
+  BinaryStreamRef Stream;
+  WrappedCtx Ctx;
+};
+
+template <typename Value, typename Extractor, typename Context>
+class VarStreamArrayImpl
+    : public VarStreamArrayBase<Value, Extractor,
+                                ContextWrapper<Value, Context>> {
+  typedef ContextWrapper<Value, Context> WrappedContext;
+  typedef VarStreamArrayImpl<Value, Extractor, Context> MyType;
+  typedef VarStreamArrayBase<Value, Extractor, WrappedContext> BaseType;
+
+public:
+  typedef Context ContextType;
+
+  VarStreamArrayImpl() = default;
+  VarStreamArrayImpl(BinaryStreamRef Stream, Context &&Ctx)
+      : BaseType(Stream, WrappedContext(std::forward<Context>(Ctx))) {}
+};
+
+template <typename Value, typename Extractor>
+class VarStreamArrayImpl<Value, Extractor, void>
+    : public VarStreamArrayBase<Value, Extractor, ContextWrapper<Value, void>> {
+  typedef ContextWrapper<Value, void> WrappedContext;
+  typedef VarStreamArrayImpl<Value, Extractor, void> MyType;
+  typedef VarStreamArrayBase<Value, Extractor, WrappedContext> BaseType;
+
+public:
+  VarStreamArrayImpl() = default;
+  VarStreamArrayImpl(BinaryStreamRef Stream)
+      : BaseType(Stream, WrappedContext()) {}
+};
+
+template <typename Value, typename Extractor = VarStreamArrayExtractor<Value>>
+using VarStreamArray =
+    VarStreamArrayImpl<Value, Extractor, typename Extractor::ContextType>;
+
 template <typename T> class FixedStreamArrayIterator;
 
 /// FixedStreamArray is similar to VarStreamArray, except with each record
diff --git a/include/llvm/Support/BinaryStreamReader.h b/include/llvm/Support/BinaryStreamReader.h
index f30d82d81b25..77738077f5ff 100644
--- a/include/llvm/Support/BinaryStreamReader.h
+++ b/include/llvm/Support/BinaryStreamReader.h
@@ -31,6 +31,7 @@ namespace llvm {
 /// are overridable.
 class BinaryStreamReader {
 public:
+  BinaryStreamReader() = default;
   explicit BinaryStreamReader(BinaryStreamRef Stream);
   virtual ~BinaryStreamReader() {}
 
@@ -172,13 +173,29 @@ public:
   /// \returns a success error code if the data was successfully read, otherwise
   /// returns an appropriate error code.
   template <typename T, typename U>
-  Error
-  readArray(VarStreamArray<T, U> &Array, uint32_t Size,
-            typename VarStreamArray<T, U>::ContextType *Context = nullptr) {
+  Error readArray(VarStreamArray<T, U> &Array, uint32_t Size) {
     BinaryStreamRef S;
     if (auto EC = readStreamRef(S, Size))
       return EC;
-    Array = VarStreamArray<T, U>(S, Context);
+    Array = VarStreamArray<T, U>(S);
+    return Error::success();
+  }
+
+  /// Read a VarStreamArray of size \p Size bytes and store the result into
+  /// \p Array.  Updates the stream's offset to point after the newly read
+  /// array.  Never causes a copy (although iterating the elements of the
+  /// VarStreamArray may, depending upon the implementation of the underlying
+  /// stream).
+  ///
+  /// \returns a success error code if the data was successfully read, otherwise
+  /// returns an appropriate error code.
+  template <typename T, typename U, typename ContextType>
+  Error readArray(VarStreamArray<T, U> &Array, uint32_t Size,
+                  ContextType &&Context) {
+    BinaryStreamRef S;
+    if (auto EC = readStreamRef(S, Size))
+      return EC;
+    Array = VarStreamArray<T, U>(S, std::move(Context));
     return Error::success();
   }
 
@@ -227,6 +244,9 @@ public:
   /// \returns the next byte in the stream.
   uint8_t peek() const;
 
+  std::pair<BinaryStreamReader, BinaryStreamReader>
+  split(uint32_t Offset) const;
+
 private:
   BinaryStreamRef Stream;
   uint32_t Offset;
diff --git a/include/llvm/Support/BinaryStreamRef.h b/include/llvm/Support/BinaryStreamRef.h
index 23ce02fd7ca4..465e724a6886 100644
--- a/include/llvm/Support/BinaryStreamRef.h
+++ b/include/llvm/Support/BinaryStreamRef.h
@@ -98,6 +98,9 @@ public:
   BinaryStreamRef(BinaryStreamRef &S, uint32_t Offset,
                   uint32_t Length) = delete;
 
+  /// Check if a Stream is valid.
+  bool valid() const { return Stream != nullptr; }
+
   /// Given an Offset into this StreamRef and a Size, return a reference to a
   /// buffer owned by the stream.
   ///
diff --git a/include/llvm/Support/BinaryStreamWriter.h b/include/llvm/Support/BinaryStreamWriter.h
index 6734a797ccc4..1b61c32a2541 100644
--- a/include/llvm/Support/BinaryStreamWriter.h
+++ b/include/llvm/Support/BinaryStreamWriter.h
@@ -20,6 +20,7 @@
 #include "llvm/Support/Error.h"
 #include <cstdint>
 #include <type_traits>
+#include <utility>
 
 namespace llvm {
 
@@ -30,8 +31,6 @@ namespace llvm {
 /// although no methods are overridable.
 class BinaryStreamWriter {
 public:
-  // FIXME: We should be able to slice and drop_front etc on Writers / Readers.
-
   BinaryStreamWriter() = default;
   explicit BinaryStreamWriter(WritableBinaryStreamRef Stream);
   virtual ~BinaryStreamWriter() {}
@@ -152,6 +151,9 @@ public:
     return writeStreamRef(Array.getUnderlyingStream());
   }
 
+  /// Splits the Writer into two Writers at a given offset.
+  std::pair<BinaryStreamWriter, BinaryStreamWriter> split(uint32_t Off) const;
+
   void setOffset(uint32_t Off) { Offset = Off; }
   uint32_t getOffset() const { return Offset; }
   uint32_t getLength() const { return Stream.getLength(); }
diff --git a/include/llvm/Support/DataExtractor.h b/include/llvm/Support/DataExtractor.h
index 2d1180c228e3..380b628fd95f 100644
--- a/include/llvm/Support/DataExtractor.h
+++ b/include/llvm/Support/DataExtractor.h
@@ -58,6 +58,28 @@ public:
   ///     NULL will be returned.
   const char *getCStr(uint32_t *offset_ptr) const;
 
+  /// Extract a C string from \a *OffsetPtr.
+  ///
+  /// Returns a StringRef for the C String from the data at the offset
+  /// pointed to by \a OffsetPtr. A variable length NULL terminated C
+  /// string will be extracted and the \a OffsetPtr will be
+  /// updated with the offset of the byte that follows the NULL
+  /// terminator byte.
+  ///
+  /// \param[in,out] OffsetPtr
+  ///     A pointer to an offset within the data that will be advanced
+  ///     by the appropriate number of bytes if the value is extracted
+  ///     correctly. If the offset is out of bounds or there are not
+  ///     enough bytes to extract this value, the offset will be left
+  ///     unmodified.
+  ///
+  /// \return
+  ///     A StringRef for the C string value in the data. If the offset
+  ///     pointed to by \a OffsetPtr is out of bounds, or if the
+  ///     offset plus the length of the C string is out of bounds,
+  ///     a default-initialized StringRef will be returned.
+  StringRef getCStrRef(uint32_t *OffsetPtr) const;
+
   /// Extract an unsigned integer of size \a byte_size from \a
   /// *offset_ptr.
   ///
diff --git a/include/llvm/Support/ELFRelocs/Hexagon.def b/include/llvm/Support/ELFRelocs/Hexagon.def
index 74e1d405cebd..5021e2b26ce5 100644
--- a/include/llvm/Support/ELFRelocs/Hexagon.def
+++ b/include/llvm/Support/ELFRelocs/Hexagon.def
@@ -99,3 +99,8 @@ ELF_RELOC(R_HEX_LD_GOT_32_6_X,       91)
 ELF_RELOC(R_HEX_LD_GOT_16_X,         92)
 ELF_RELOC(R_HEX_LD_GOT_11_X,         93)
 ELF_RELOC(R_HEX_23_REG,              94)
+ELF_RELOC(R_HEX_GD_PLT_B22_PCREL_X,  95)
+ELF_RELOC(R_HEX_GD_PLT_B32_PCREL_X,  96)
+ELF_RELOC(R_HEX_LD_PLT_B22_PCREL_X,  97)
+ELF_RELOC(R_HEX_LD_PLT_B32_PCREL_X,  98)
+ELF_RELOC(R_HEX_27_REG,              99)
diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index aa9230044b1f..ced183852146 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -2061,6 +2061,14 @@ public:
     return false;
   }
 
+  // Return true if the instruction that performs a << b actually performs
+  // a << (b % (sizeof(a) * 8)).
+  virtual bool supportsModuloShift(ISD::NodeType Inst, EVT ReturnType) const {
+    assert((Inst == ISD::SHL || Inst == ISD::SRA || Inst == ISD::SRL) &&
+           "Expect a shift instruction");
+    return false;
+  }
+
   //===--------------------------------------------------------------------===//
   // Runtime Library hooks
   //