Fixed global object leak

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index b715e8923ff26184b43d2f5f432e9e5a3cf778d3..96b88c5285c9962d479fa75d0e71031cd0c35b6c 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -170,19 +170,18 @@ function GlobalParseFloat(string) {
 function GlobalEval(x) {
   if (!IS_STRING(x)) return x;
 
-  var global_receiver = %GlobalReceiver(global);
-  var global_is_detached = (global === global_receiver);
-
   // For consistency with JSC we require the global object passed to
   // eval to be the global object from which 'eval' originated. This
   // is not mandated by the spec.
   // We only throw if the global has been detached, since we need the
   // receiver as this-value for the call.
-  if (global_is_detached) {
+  if (!%IsAttachedGlobal(global)) {
     throw new $EvalError('The "this" value passed to eval must ' +
                          'be the global object from which eval originated');
   }
 
+  var global_receiver = %GlobalReceiver(global);
+
   var f = %CompileString(x, false);
   if (!IS_FUNCTION(f)) return f;