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diff --git a/include/llvm/Analysis/ModuleSummaryAnalysis.h b/include/llvm/Analysis/ModuleSummaryAnalysis.h
new file mode 100644
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+++ b/include/llvm/Analysis/ModuleSummaryAnalysis.h
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+//===- ModuleSummaryAnalysis.h - Module summary index builder ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This is the interface to build a ModuleSummaryIndex for a module.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_MODULESUMMARYANALYSIS_H
+#define LLVM_ANALYSIS_MODULESUMMARYANALYSIS_H
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/IR/ModuleSummaryIndex.h"
+#include "llvm/Pass.h"
+
+namespace llvm {
+
+class BlockFrequencyInfo;
+
+/// Class to build a module summary index for the given Module, possibly from
+/// a Pass.
+class ModuleSummaryIndexBuilder {
+  /// The index being built
+  std::unique_ptr<ModuleSummaryIndex> Index;
+  /// The module for which we are building an index
+  const Module *M;
+
+public:
+  /// Default constructor
+  ModuleSummaryIndexBuilder() = default;
+
+  /// Constructor that builds an index for the given Module. An optional
+  /// callback can be supplied to obtain the frequency info for a function.
+  ModuleSummaryIndexBuilder(
+      const Module *M,
+      std::function<BlockFrequencyInfo *(const Function &F)> Ftor = nullptr);
+
+  /// Get a reference to the index owned by builder
+  ModuleSummaryIndex &getIndex() const { return *Index; }
+
+  /// Take ownership of the built index
+  std::unique_ptr<ModuleSummaryIndex> takeIndex() { return std::move(Index); }
+
+private:
+  /// Compute summary for given function with optional frequency information
+  void computeFunctionSummary(const Function &F,
+                              BlockFrequencyInfo *BFI = nullptr);
+
+  /// Compute summary for given variable with optional frequency information
+  void computeVariableSummary(const GlobalVariable &V);
+};
+
+/// Legacy wrapper pass to provide the ModuleSummaryIndex object.
+class ModuleSummaryIndexWrapperPass : public ModulePass {
+  std::unique_ptr<ModuleSummaryIndexBuilder> IndexBuilder;
+
+public:
+  static char ID;
+
+  ModuleSummaryIndexWrapperPass();
+
+  /// Get the index built by pass
+  ModuleSummaryIndex &getIndex() { return IndexBuilder->getIndex(); }
+  const ModuleSummaryIndex &getIndex() const {
+    return IndexBuilder->getIndex();
+  }
+
+  bool runOnModule(Module &M) override;
+  bool doFinalization(Module &M) override;
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
+};
+
+//===--------------------------------------------------------------------===//
+//
+// createModuleSummaryIndexWrapperPass - This pass builds a ModuleSummaryIndex
+// object for the module, to be written to bitcode or LLVM assembly.
+//
+ModulePass *createModuleSummaryIndexWrapperPass();
+
+/// Returns true if \p M is eligible for ThinLTO promotion.
+///
+/// Currently we check if it has any any InlineASM that uses an internal symbol.
+bool moduleCanBeRenamedForThinLTO(const Module &M);
+}
+
+#endif