[es6] implement Object.assign

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 7fb317db7e9e2860ab4cd5c6e53da54d4a4c3de5..00455bef76fe1b4eea48619fc33dd031d62b5e42 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -259,16 +259,21 @@ function ObjectIsPrototypeOf(V) {
 
 
 // ECMA-262 - 15.2.4.6
-function ObjectPropertyIsEnumerable(V) {
+function ObjectPropertyIsEnumerableJS(O, V) {
   var P = ToName(V);
-  if (%_IsJSProxy(this)) {
+  if (%_IsJSProxy(O)) {
     // TODO(rossberg): adjust once there is a story for symbols vs proxies.
     if (IS_SYMBOL(V)) return false;
 
-    var desc = GetOwnPropertyJS(this, P);
+    var desc = GetOwnPropertyJS(O, P);
     return IS_UNDEFINED(desc) ? false : desc.isEnumerable();
   }
-  return %IsPropertyEnumerable(ToObject(this), P);
+  return %IsPropertyEnumerable(ToObject(O), P);
+}
+
+
+function ObjectPropertyIsEnumerable(V) {
+  return ObjectPropertyIsEnumerableJS(this, V);
 }