Convert global objects to global receivers before invoking

JavaScript functions on them.
Review URL: http://codereview.chromium.org/165122

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2642 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/execution.cc

@@ -83,6 +83,14 @@ static Handle<Object> Invoke(bool construct,
     code = stub.GetCode();
   }
 
+  // Convert calls on global objects to be calls on the global
+  // receiver instead to avoid having a 'this' pointer which refers
+  // directly to a global object.
+  if (receiver->IsGlobalObject()) {
+    Handle<GlobalObject> global = Handle<GlobalObject>::cast(receiver);
+    receiver = Handle<JSObject>(global->global_receiver());
+  }
+
   {
     // Save and restore context around invocation and block the
     // allocation of handles without explicit handle scopes.