Do deferred migration of maps after deoptimizing once.

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 3857 matching lines @@
 }
 
 
 void JSObject::MigrateInstance(Handle<JSObject> object) {
   // Converting any field to the most specific type will cause the
   // GeneralizeFieldRepresentation algorithm to create the most general existing
   // transition that matches the object. This achieves what is needed.
   Handle<Map> original_map(object->map());
   GeneralizeFieldRepresentation(
       object, 0, Representation::None(), ALLOW_AS_CONSTANT);
+  original_map->set_has_migrated(true);
   if (FLAG_trace_migration) {
     object->PrintInstanceMigration(stdout, *original_map, object->map());
   }
 }
 
 
 Handle<Object> JSObject::TryMigrateInstance(Handle<JSObject> object) {
   Map* new_map = object->map()->CurrentMapForDeprecated();
   if (new_map == NULL) return Handle<Object>();
   Handle<Map> original_map(object->map());
@@ skipping 12780 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal