harmony_scoping: Implement lexical bindings at top level

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 0288bfb81b7e54558da93d22665009a8c30f7d1e..d2d92bf678474bff42434869e40d5844564c0093 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -767,6 +767,14 @@ bool Object::IsNativeContext() const {
 }
 
 
+bool Object::IsGlobalContextTable() const {
+  if (!Object::IsHeapObject()) return false;
+  Map* map = HeapObject::cast(this)->map();
+  Heap* heap = map->GetHeap();
+  return map == heap->global_context_table_map();
+}
+
+
 bool Object::IsScopeInfo() const {
   return Object::IsHeapObject() &&
       HeapObject::cast(this)->map() ==