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diff --git a/contrib/llvm-project/llvm/lib/CodeGen/LiveDebugVariables.h b/contrib/llvm-project/llvm/lib/CodeGen/LiveDebugVariables.h
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+//===- LiveDebugVariables.h - Tracking debug info variables -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the interface to the LiveDebugVariables analysis.
+//
+// The analysis removes DBG_VALUE instructions for virtual registers and tracks
+// live user variables in a data structure that can be updated during register
+// allocation.
+//
+// After register allocation new DBG_VALUE instructions are emitted to reflect
+// the new locations of user variables.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
+#define LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H
+
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/Support/Compiler.h"
+
+namespace llvm {
+
+template <typename T> class ArrayRef;
+class LiveIntervals;
+class VirtRegMap;
+
+class LLVM_LIBRARY_VISIBILITY LiveDebugVariables : public MachineFunctionPass {
+  void *pImpl = nullptr;
+
+public:
+  static char ID; // Pass identification, replacement for typeid
+
+  LiveDebugVariables();
+  ~LiveDebugVariables() override;
+
+  /// splitRegister - Move any user variables in OldReg to the live ranges in
+  /// NewRegs where they are live. Mark the values as unavailable where no new
+  /// register is live.
+  void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
+                     LiveIntervals &LIS);
+
+  /// emitDebugValues - Emit new DBG_VALUE instructions reflecting the changes
+  /// that happened during register allocation.
+  /// @param VRM Rename virtual registers according to map.
+  void emitDebugValues(VirtRegMap *VRM);
+
+  /// dump - Print data structures to dbgs().
+  void dump() const;
+
+private:
+  bool runOnMachineFunction(MachineFunction &) override;
+  void releaseMemory() override;
+  void getAnalysisUsage(AnalysisUsage &) const override;
+  bool doInitialization(Module &) override;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_CODEGEN_LIVEDEBUGVARIABLES_H