Don't use fast literal if the boilerplate map is still deprecated.

src/objects.cc

 // Copyright 2013 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 3626 matching lines @@
     PrintF("migrating instance %p (%p)\n",
            static_cast<void*>(*object),
            static_cast<void*>(object->map()));
   }
   CALL_HEAP_FUNCTION_VOID(
       object->GetIsolate(),
       object->MigrateInstance());
 }
 
 
+Handle<Object> JSObject::TryMigrateInstance(Handle<JSObject> object) {
+  if (FLAG_trace_migration) {
+    PrintF("migrating instance (no new maps) %p (%p)\n",
+           static_cast<void*>(*object),
+           static_cast<void*>(object->map()));
+  }
+  CALL_HEAP_FUNCTION(
+      object->GetIsolate(),
+      object->MigrateInstance(),
+      Object);
+}
+
+
 Handle<Map> Map::GeneralizeRepresentation(Handle<Map> map,
                                           int modify_index,
                                           Representation representation) {
   CALL_HEAP_FUNCTION(
       map->GetIsolate(),
       map->GeneralizeRepresentation(modify_index, representation),
       Map);
 }
 
 
@@ skipping 11958 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal