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diff --git a/contrib/llvm-project/llvm/include/llvm/CodeGen/MIRParser/MIRParser.h b/contrib/llvm-project/llvm/include/llvm/CodeGen/MIRParser/MIRParser.h
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+//===- MIRParser.h - MIR serialization format parser ------------*- 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 MIR serialization library is currently a work in progress. It can't
+// serialize machine functions at this time.
+//
+// This file declares the functions that parse the MIR serialization format
+// files.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_MIRPARSER_MIRPARSER_H
+#define LLVM_CODEGEN_MIRPARSER_MIRPARSER_H
+
+#include "llvm/IR/Module.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include <memory>
+
+namespace llvm {
+
+class StringRef;
+class MIRParserImpl;
+class MachineModuleInfo;
+class SMDiagnostic;
+
+/// This class initializes machine functions by applying the state loaded from
+/// a MIR file.
+class MIRParser {
+  std::unique_ptr<MIRParserImpl> Impl;
+
+public:
+  MIRParser(std::unique_ptr<MIRParserImpl> Impl);
+  MIRParser(const MIRParser &) = delete;
+  ~MIRParser();
+
+  /// Parses the optional LLVM IR module in the MIR file.
+  ///
+  /// A new, empty module is created if the LLVM IR isn't present.
+  /// \returns nullptr if a parsing error occurred.
+  std::unique_ptr<Module> parseIRModule();
+
+  /// Parses MachineFunctions in the MIR file and add them to the given
+  /// MachineModuleInfo \p MMI.
+  ///
+  /// \returns true if an error occurred.
+  bool parseMachineFunctions(Module &M, MachineModuleInfo &MMI);
+};
+
+/// This function is the main interface to the MIR serialization format parser.
+///
+/// It reads in a MIR file and returns a MIR parser that can parse the embedded
+/// LLVM IR module and initialize the machine functions by parsing the machine
+/// function's state.
+///
+/// \param Filename - The name of the file to parse.
+/// \param Error - Error result info.
+/// \param Context - Context which will be used for the parsed LLVM IR module.
+std::unique_ptr<MIRParser> createMIRParserFromFile(StringRef Filename,
+                                                   SMDiagnostic &Error,
+                                                   LLVMContext &Context);
+
+/// This function is another interface to the MIR serialization format parser.
+///
+/// It returns a MIR parser that works with the given memory buffer and that can
+/// parse the embedded LLVM IR module and initialize the machine functions by
+/// parsing the machine function's state.
+///
+/// \param Contents - The MemoryBuffer containing the machine level IR.
+/// \param Context - Context which will be used for the parsed LLVM IR module.
+std::unique_ptr<MIRParser>
+createMIRParser(std::unique_ptr<MemoryBuffer> Contents, LLVMContext &Context);
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_MIRPARSER_MIRPARSER_H