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diff --git a/clang-r353983/include/llvm/Transforms/IPO/ConstantMerge.h b/clang-r353983/include/llvm/Transforms/IPO/ConstantMerge.h
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+++ b/clang-r353983/include/llvm/Transforms/IPO/ConstantMerge.h
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+//===- ConstantMerge.h - Merge duplicate global constants -------*- 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 interface to a pass that merges duplicate global
+// constants together into a single constant that is shared.  This is useful
+// because some passes (ie TraceValues) insert a lot of string constants into
+// the program, regardless of whether or not an existing string is available.
+//
+// Algorithm: ConstantMerge is designed to build up a map of available constants
+// and eliminate duplicates when it is initialized.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H
+#define LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H
+
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+
+class Module;
+
+/// A pass that merges duplicate global constants into a single constant.
+class ConstantMergePass : public PassInfoMixin<ConstantMergePass> {
+public:
+  PreservedAnalyses run(Module &M, ModuleAnalysisManager &);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_IPO_CONSTANTMERGE_H