Always require exact maps.

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index cb3c68ea8eeeacb2d105ee62a800ac5480fdf3d9..03d9fe93e2b7cbd8517d953bf240a5bb05b509ae 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -765,7 +765,7 @@ void StubCompiler::GenerateStoreTransition(MacroAssembler* masm,
                                            Label* miss_restore_name) {
   // Check that the map of the object hasn't changed.
   __ CheckMap(receiver_reg, Handle<Map>(object->map()),
-              miss_label, DO_SMI_CHECK, REQUIRE_EXACT_MAP);
+              miss_label, DO_SMI_CHECK);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -900,7 +900,7 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
                                       Label* miss_label) {
   // Check that the map of the object hasn't changed.
   __ CheckMap(receiver_reg, Handle<Map>(object->map()),
-              miss_label, DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
+              miss_label, DO_SMI_CHECK);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -1041,8 +1041,7 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
       bool in_new_space = heap()->InNewSpace(*prototype);
       Handle<Map> current_map(current->map());
       if (!current.is_identical_to(first) || check == CHECK_ALL_MAPS) {
-        __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK,
-                    ALLOW_ELEMENT_TRANSITION_MAPS);
+        __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK);
       }
 
       // Check access rights to the global object.  This has to happen after
@@ -1083,8 +1082,7 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
 
   if (!holder.is_identical_to(first) || check == CHECK_ALL_MAPS) {
     // Check the holder map.
-    __ CheckMap(reg, Handle<Map>(holder->map()),
-                miss, DONT_DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
+    __ CheckMap(reg, Handle<Map>(holder->map()), miss, DONT_DO_SMI_CHECK);
   }
 
   // Perform security check for access to the global object.
@@ -2715,8 +2713,7 @@ Handle<Code> StoreStubCompiler::CompileStoreInterceptor(
   Label miss;
 
   // Check that the map of the object hasn't changed.
-  __ CheckMap(receiver(), Handle<Map>(object->map()),
-              &miss, DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
+  __ CheckMap(receiver(), Handle<Map>(object->map()), &miss, DO_SMI_CHECK);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {