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diff --git a/clang-r344140b/include/clang/AST/ODRHash.h b/clang-r344140b/include/clang/AST/ODRHash.h
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+++ b/clang-r344140b/include/clang/AST/ODRHash.h
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+//===-- ODRHash.h - Hashing to diagnose ODR failures ------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file contains the declaration of the ODRHash class, which calculates
+/// a hash based on AST nodes, which is stable across different runs.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_ODRHASH_H
+#define LLVM_CLANG_AST_ODRHASH_H
+
+#include "clang/AST/DeclarationName.h"
+#include "clang/AST/Type.h"
+#include "clang/AST/TemplateBase.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/PointerUnion.h"
+#include "llvm/ADT/SmallVector.h"
+
+namespace clang {
+
+class Decl;
+class IdentifierInfo;
+class NestedNameSpecifier;
+class Stmt;
+class TemplateParameterList;
+
+// ODRHash is used to calculate a hash based on AST node contents that
+// does not rely on pointer addresses.  This allows the hash to not vary
+// between runs and is usable to detect ODR problems in modules.  To use,
+// construct an ODRHash object, then call Add* methods over the nodes that
+// need to be hashed.  Then call CalculateHash to get the hash value.
+// Typically, only one Add* call is needed.  clear can be called to reuse the
+// object.
+class ODRHash {
+  // Use DenseMaps to convert from DeclarationName and Type pointers
+  // to an index value.
+  llvm::DenseMap<DeclarationName, unsigned> DeclNameMap;
+
+  // Save space by processing bools at the end.
+  llvm::SmallVector<bool, 128> Bools;
+
+  llvm::FoldingSetNodeID ID;
+
+public:
+  ODRHash() {}
+
+  // Use this for ODR checking classes between modules.  This method compares
+  // more information than the AddDecl class.
+  void AddCXXRecordDecl(const CXXRecordDecl *Record);
+
+  // Use this for ODR checking functions between modules.  This method compares
+  // more information than the AddDecl class.  SkipBody will process the
+  // hash as if the function has no body.
+  void AddFunctionDecl(const FunctionDecl *Function, bool SkipBody = false);
+
+  // Use this for ODR checking enums between modules.  This method compares
+  // more information than the AddDecl class.
+  void AddEnumDecl(const EnumDecl *Enum);
+
+  // Process SubDecls of the main Decl.  This method calls the DeclVisitor
+  // while AddDecl does not.
+  void AddSubDecl(const Decl *D);
+
+  // Reset the object for reuse.
+  void clear();
+
+  // Add booleans to ID and uses it to calculate the hash.
+  unsigned CalculateHash();
+
+  // Add AST nodes that need to be processed.
+  void AddDecl(const Decl *D);
+  void AddType(const Type *T);
+  void AddQualType(QualType T);
+  void AddStmt(const Stmt *S);
+  void AddIdentifierInfo(const IdentifierInfo *II);
+  void AddNestedNameSpecifier(const NestedNameSpecifier *NNS);
+  void AddTemplateName(TemplateName Name);
+  void AddDeclarationName(DeclarationName Name, bool TreatAsDecl = false);
+  void AddTemplateArgument(TemplateArgument TA);
+  void AddTemplateParameterList(const TemplateParameterList *TPL);
+
+  // Save booleans until the end to lower the size of data to process.
+  void AddBoolean(bool value);
+
+  static bool isWhitelistedDecl(const Decl* D, const DeclContext *Parent);
+
+private:
+  void AddDeclarationNameImpl(DeclarationName Name);
+};
+
+}  // end namespace clang
+
+#endif