Index: include/clang/AST/ODRHash.h
===================================================================
--- include/clang/AST/ODRHash.h
+++ include/clang/AST/ODRHash.h
@@ -40,7 +40,6 @@
   // Use DenseMaps to convert from DeclarationName and Type pointers
   // to an index value.
   llvm::DenseMap<DeclarationName, unsigned> DeclNameMap;
-  llvm::DenseMap<const Type*, unsigned> TypeMap;
 
   // Save space by processing bools at the end.
   llvm::SmallVector<bool, 128> Bools;
Index: lib/AST/ODRHash.cpp
===================================================================
--- lib/AST/ODRHash.cpp
+++ lib/AST/ODRHash.cpp
@@ -180,7 +180,6 @@
 
 void ODRHash::clear() {
   DeclNameMap.clear();
-  TypeMap.clear();
   Bools.clear();
   ID.clear();
 }
@@ -749,14 +748,6 @@
 
 void ODRHash::AddType(const Type *T) {
   assert(T && "Expecting non-null pointer.");
-  auto Result = TypeMap.insert(std::make_pair(T, TypeMap.size()));
-  ID.AddInteger(Result.first->second);
-  // On first encounter of a Type pointer, process it.  Every time afterwards,
-  // only the index value is needed.
-  if (!Result.second) {
-    return;
-  }
-
   ODRTypeVisitor(ID, *this).Visit(T);
 }
 
Index: test/Modules/Inputs/odr_hash-elaborated-types/first.h
===================================================================
--- test/Modules/Inputs/odr_hash-elaborated-types/first.h
+++ test/Modules/Inputs/odr_hash-elaborated-types/first.h
@@ -0,0 +1,6 @@
+#ifndef FIRST
+#define FIRST
+
+#include "textual_time.h"
+
+#endif
Index: test/Modules/Inputs/odr_hash-elaborated-types/module.modulemap
===================================================================
--- test/Modules/Inputs/odr_hash-elaborated-types/module.modulemap
+++ test/Modules/Inputs/odr_hash-elaborated-types/module.modulemap
@@ -0,0 +1,5 @@
+module M {
+  module first { header "first.h" export *}
+  module second { header "second.h" export *}
+  export *
+}
Index: test/Modules/Inputs/odr_hash-elaborated-types/second.h
===================================================================
--- test/Modules/Inputs/odr_hash-elaborated-types/second.h
+++ test/Modules/Inputs/odr_hash-elaborated-types/second.h
@@ -0,0 +1,6 @@
+#ifndef SECOND
+#define SECOND
+
+#include "textual_stat.h"
+
+#endif
Index: test/Modules/Inputs/odr_hash-elaborated-types/textual_stat.h
===================================================================
--- test/Modules/Inputs/odr_hash-elaborated-types/textual_stat.h
+++ test/Modules/Inputs/odr_hash-elaborated-types/textual_stat.h
@@ -0,0 +1,11 @@
+#ifndef _SYS_STAT_H
+#define _SYS_STAT_H
+
+#include "textual_time.h"
+
+struct stat {
+  struct timespec st_atim;
+  struct timespec st_mtim;
+};
+
+#endif
Index: test/Modules/Inputs/odr_hash-elaborated-types/textual_time.h
===================================================================
--- test/Modules/Inputs/odr_hash-elaborated-types/textual_time.h
+++ test/Modules/Inputs/odr_hash-elaborated-types/textual_time.h
@@ -0,0 +1,6 @@
+#ifndef _TIME_H
+#define _TIME_H
+
+struct timespec { };
+
+#endif
Index: test/Modules/odr_hash-elaborated-types.cpp
===================================================================
--- test/Modules/odr_hash-elaborated-types.cpp
+++ test/Modules/odr_hash-elaborated-types.cpp
@@ -0,0 +1,12 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -std=c++1z -I%S/Inputs/odr_hash-elaborated-types -verify %s
+// RUN: %clang_cc1 -std=c++1z -fmodules -fmodules-local-submodule-visibility -fmodule-map-file=%S/Inputs/odr_hash-elaborated-types/module.modulemap -fmodules-cache-path=%t -x c++ -I%S/Inputs/odr_hash-elaborated-types -verify %s
+
+#include "textual_stat.h"
+
+#include "first.h"
+#include "second.h"
+
+void use() { struct stat value; }
+
+// expected-no-diagnostics