Update ObjectToString to Harmony-draft algorithm

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 92f377c4ef1b6ddf3766279d06ce6aecd585cd5a..edddd5403ad11068d1fca64cc84008cc5e0555b2 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -215,6 +215,7 @@ SetUpGlobal();
 // ----------------------------------------------------------------------------
 // Object
 
+var DefaultObjectToString = ObjectToString;

[Dmitry Lomov (no reviews), 2014/10/21 06:11:53]

Please rename ObjectToString to NoSideEffectsObjectToString.
We should continue using it instead of the ES6 one in bulitins even after we
ship the ES6 one.

[caitp (gmail), 2014/10/21 14:54:45]

Acknowledged.

 // ECMA-262 - 15.2.4.2
 function ObjectToString() {
   if (IS_UNDEFINED(this) && !IS_UNDETECTABLE(this)) return "[object Undefined]";