Always require exact maps.

src/arm/stub-cache-arm.cc

Index: src/arm/stub-cache-arm.cc
diff --git a/src/arm/stub-cache-arm.cc b/src/arm/stub-cache-arm.cc
index 24a83bb3d6640592072f8b24b2b30669e265e913..ea610954cdfcb62da437723225c7ae0ea174945d 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -458,7 +458,7 @@ void StubCompiler::GenerateStoreTransition(MacroAssembler* masm,
 
   // Check that the map of the object hasn't changed.
   __ CheckMap(receiver_reg, scratch1, Handle<Map>(object->map()), miss_label,
-              DO_SMI_CHECK, REQUIRE_EXACT_MAP);
+              DO_SMI_CHECK);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -606,7 +606,7 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
 
   // Check that the map of the object hasn't changed.
   __ CheckMap(receiver_reg, scratch1, Handle<Map>(object->map()), miss_label,
-              DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
+              DO_SMI_CHECK);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -1132,8 +1132,7 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
       if (!current.is_identical_to(first) || check == CHECK_ALL_MAPS) {
         Handle<Map> current_map(current->map());
         // CheckMap implicitly loads the map of |reg| into |map_reg|.
-        __ CheckMap(reg, map_reg, current_map, miss, DONT_DO_SMI_CHECK,
-                    ALLOW_ELEMENT_TRANSITION_MAPS);
+        __ CheckMap(reg, map_reg, current_map, miss, DONT_DO_SMI_CHECK);
       } else {
         __ ldr(map_reg, FieldMemOperand(reg, HeapObject::kMapOffset));
       }
@@ -1170,7 +1169,7 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
   if (!holder.is_identical_to(first) || check == CHECK_ALL_MAPS) {
     // Check the holder map.
     __ CheckMap(reg, scratch1, Handle<Map>(holder->map()), miss,
-                DONT_DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
+                DONT_DO_SMI_CHECK);
   }
 
   // Perform security check for access to the global object.
@@ -2682,7 +2681,7 @@ Handle<Code> StoreStubCompiler::CompileStoreInterceptor(
 
   // Check that the map of the object hasn't changed.
   __ CheckMap(receiver(), scratch1(), Handle<Map>(object->map()), &miss,
-              DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
+              DO_SMI_CHECK);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {