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diff --git a/clang-r353983/include/llvm/IR/TypeFinder.h b/clang-r353983/include/llvm/IR/TypeFinder.h
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+//===- llvm/IR/TypeFinder.h - Class to find used struct types ---*- 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 contains the declaration of the TypeFinder class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_TYPEFINDER_H
+#define LLVM_IR_TYPEFINDER_H
+
+#include "llvm/ADT/DenseSet.h"
+#include <cstddef>
+#include <vector>
+
+namespace llvm {
+
+class MDNode;
+class Module;
+class StructType;
+class Type;
+class Value;
+
+/// TypeFinder - Walk over a module, identifying all of the types that are
+/// used by the module.
+class TypeFinder {
+  // To avoid walking constant expressions multiple times and other IR
+  // objects, we keep several helper maps.
+  DenseSet<const Value*> VisitedConstants;
+  DenseSet<const MDNode *> VisitedMetadata;
+  DenseSet<Type*> VisitedTypes;
+
+  std::vector<StructType*> StructTypes;
+  bool OnlyNamed = false;
+
+public:
+  TypeFinder() = default;
+
+  void run(const Module &M, bool onlyNamed);
+  void clear();
+
+  using iterator = std::vector<StructType*>::iterator;
+  using const_iterator = std::vector<StructType*>::const_iterator;
+
+  iterator begin() { return StructTypes.begin(); }
+  iterator end() { return StructTypes.end(); }
+
+  const_iterator begin() const { return StructTypes.begin(); }
+  const_iterator end() const { return StructTypes.end(); }
+
+  bool empty() const { return StructTypes.empty(); }
+  size_t size() const { return StructTypes.size(); }
+  iterator erase(iterator I, iterator E) { return StructTypes.erase(I, E); }
+
+  StructType *&operator[](unsigned Idx) { return StructTypes[Idx]; }
+
+  DenseSet<const MDNode *> &getVisitedMetadata() { return VisitedMetadata; }
+
+private:
+  /// incorporateType - This method adds the type to the list of used
+  /// structures if it's not in there already.
+  void incorporateType(Type *Ty);
+
+  /// incorporateValue - This method is used to walk operand lists finding types
+  /// hiding in constant expressions and other operands that won't be walked in
+  /// other ways.  GlobalValues, basic blocks, instructions, and inst operands
+  /// are all explicitly enumerated.
+  void incorporateValue(const Value *V);
+
+  /// incorporateMDNode - This method is used to walk the operands of an MDNode
+  /// to find types hiding within.
+  void incorporateMDNode(const MDNode *V);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_IR_TYPEFINDER_H