Go into slow case when encountering object initialization on the top level to...

src/runtime.h

 // Copyright 2006-2008 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 31 matching lines @@
   F(GetProperty, 2) \
   F(KeyedGetProperty, 2) \
   F(DeleteProperty, 2) \
   F(HasLocalProperty, 2) \
   F(HasProperty, 2) \
   F(HasElement, 2) \
   F(IsPropertyEnumerable, 2) \
   F(GetPropertyNames, 1) \
   F(GetPropertyNamesFast, 1) \
   F(GetArgumentsProperty, 1) \
+  F(ToFastProperties, 1) \
+  F(ToSlowProperties, 1) \
   \
   F(IsInPrototypeChain, 2) \
   \
   F(IsConstructCall, 0) \
   \
   /* Utilities */ \
   F(GetCalledFunction, 0) \
   F(GetFunctionDelegate, 1) \
   F(NewArguments, 1) \
   F(NewArgumentsFast, 3) \
@@ skipping 303 matching lines @@
   static Object* GetObjectProperty(Handle<Object> object, Handle<Object> key);
 
   // Helper functions used stubs.
   static void PerformGC(Object* result);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_