Merge bleeding edge up to 8774 into the GC branch.

src/builtins.cc

Index: src/builtins.cc
===================================================================
--- src/builtins.cc	(revision 8778)
+++ src/builtins.cc	(working copy)
@@ -1213,10 +1213,10 @@
   ASSERT(!CalledAsConstructor(isolate));
   Heap* heap = isolate->heap();
 
-  Handle<Object> receiver = args.at<Object>(0);
+  Handle<Object> receiver = args.receiver();
 
   // Get the object called.
-  JSObject* obj = JSObject::cast(*args.receiver());
+  JSObject* obj = JSObject::cast(*receiver);
 
   // Get the invocation callback from the function descriptor that was
   // used to create the called object.