Reland "Turn ElementsTransitionAndStore stub into a HydrogenCodeStub".

src/stub-cache.cc

Index: src/stub-cache.cc
diff --git a/src/stub-cache.cc b/src/stub-cache.cc
index a687d81a3e57351eab2d2d2b6b9839f3fc3ebfcf..1186c20552ad76f5e4826648bfdc40d3a3226b8b 100644
--- a/src/stub-cache.cc
+++ b/src/stub-cache.cc
@@ -1993,12 +1993,21 @@ Handle<Code> KeyedStoreStubCompiler::CompileStoreElementPolymorphic(
     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() ||