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diff --git a/clang-r353983e/include/llvm/CodeGen/IntrinsicLowering.h b/clang-r353983e/include/llvm/CodeGen/IntrinsicLowering.h
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+//===-- IntrinsicLowering.h - Intrinsic Function Lowering -------*- 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 defines the IntrinsicLowering interface.  This interface allows
+// addition of domain-specific or front-end specific intrinsics to LLVM without
+// having to modify all of the C backend or interpreter.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_INTRINSICLOWERING_H
+#define LLVM_CODEGEN_INTRINSICLOWERING_H
+
+#include "llvm/IR/Intrinsics.h"
+
+namespace llvm {
+class CallInst;
+class Module;
+class DataLayout;
+
+class IntrinsicLowering {
+  const DataLayout &DL;
+
+  bool Warned;
+
+public:
+  explicit IntrinsicLowering(const DataLayout &DL) : DL(DL), Warned(false) {}
+
+  /// Replace a call to the specified intrinsic function.
+  /// If an intrinsic function must be implemented by the code generator
+  /// (such as va_start), this function should print a message and abort.
+  ///
+  /// Otherwise, if an intrinsic function call can be lowered, the code to
+  /// implement it (often a call to a non-intrinsic function) is inserted
+  /// _after_ the call instruction and the call is deleted. The caller must
+  /// be capable of handling this kind of change.
+  void LowerIntrinsicCall(CallInst *CI);
+
+  /// Try to replace a call instruction with a call to a bswap intrinsic. Return
+  /// false if the call is not a simple integer bswap.
+  static bool LowerToByteSwap(CallInst *CI);
+};
+}
+
+#endif