Merge r6592, r6612, r6618 and r6626 into 2.5 branch.

src/objects.cc

Index: src/objects.cc
===================================================================
--- src/objects.cc	(revision 6626)
+++ src/objects.cc	(working copy)
@@ -6265,6 +6265,13 @@
     return UNDEFINED_ELEMENT;
   }
 
+  if (IsJSGlobalProxy()) {
+    Object* proto = GetPrototype();
+    if (proto->IsNull()) return UNDEFINED_ELEMENT;
+    ASSERT(proto->IsJSGlobalObject());
+    return JSObject::cast(proto)->HasLocalElement(index);
+  }
+
   // Check for lookup interceptor
   if (HasIndexedInterceptor()) {
     return HasElementWithInterceptor(this, index) ? INTERCEPTED_ELEMENT