Reland "Turn ElementsTransitionAndStore stub into a HydrogenCodeStub".

src/stub-cache.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1975 matching lines @@
         receiver_map->FindTransitionedMap(receiver_maps);
 
     // TODO(mvstanton): The code below is doing pessimistic elements
     // transitions. I would like to stop doing that and rely on Allocation Site
     // Tracking to do a better job of ensuring the data types are what they need
     // to be. Not all the elements are in place yet, pessimistic elements
     // transitions are still important for performance.
     bool is_js_array = receiver_map->instance_type() == JS_ARRAY_TYPE;
     ElementsKind elements_kind = receiver_map->elements_kind();
     if (!transitioned_map.is_null()) {
-      cached_stub = ElementsTransitionAndStoreStub(
-          elements_kind,
-          transitioned_map->elements_kind(),
-          is_js_array,
-          strict_mode(),
-          store_mode_).GetCode(isolate());
+      if (FLAG_compiled_transitions) {
+        cached_stub = ElementsTransitionAndStoreStub(
+            elements_kind,
+            transitioned_map->elements_kind(),
+            is_js_array,
+            store_mode_).GetCode(isolate());
+      } else {
+        // TODO(bmeurer) Remove this when compiled transitions is enabled
+        cached_stub = ElementsTransitionAndStorePlatformStub(
+            elements_kind,
+            transitioned_map->elements_kind(),
+            is_js_array,
+            strict_mode(),
+            store_mode_).GetCode(isolate());
+      }
     } else {
       if (FLAG_compiled_keyed_stores &&
           (receiver_map->has_fast_elements() ||
            receiver_map->has_external_array_elements())) {
         cached_stub = KeyedStoreFastElementStub(
             is_js_array,
             elements_kind,
             store_mode_).GetCode(isolate());
       } else {
         cached_stub = KeyedStoreElementStub(
@@ skipping 181 matching lines @@
           Handle<FunctionTemplateInfo>(
               FunctionTemplateInfo::cast(signature->receiver()));
     }
   }
 
   is_simple_api_call_ = true;
 }
 
 
 } }  // namespace v8::internal