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diff --git a/clang-r353983e/include/llvm/Transforms/Scalar/InstSimplifyPass.h b/clang-r353983e/include/llvm/Transforms/Scalar/InstSimplifyPass.h
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+//===- InstSimplifyPass.h ---------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// Defines passes for running instruction simplification across chunks of IR.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_UTILS_INSTSIMPLIFYPASS_H
+#define LLVM_TRANSFORMS_UTILS_INSTSIMPLIFYPASS_H
+
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+
+class FunctionPass;
+
+/// Run instruction simplification across each instruction in the function.
+///
+/// Instruction simplification has useful constraints in some contexts:
+/// - It will never introduce *new* instructions.
+/// - There is no need to iterate to a fixed point.
+///
+/// Many passes use instruction simplification as a library facility, but it may
+/// also be useful (in tests and other contexts) to have access to this very
+/// restricted transform at a pass granularity. However, for a much more
+/// powerful and comprehensive peephole optimization engine, see the
+/// `instcombine` pass instead.
+class InstSimplifyPass : public PassInfoMixin<InstSimplifyPass> {
+public:
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+};
+
+/// Create a legacy pass that does instruction simplification on each
+/// instruction in a function.
+FunctionPass *createInstSimplifyLegacyPass();
+
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_UTILS_INSTSIMPLIFYPASS_H