529   Handle<Map> current_map = receiver_map;  in CheckPrototypes()  local
533   while (!current_map.is_identical_to(holder_map)) {  in CheckPrototypes()
538     DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
539            !current_map->is_access_check_needed());  in CheckPrototypes()
541     prototype = handle(JSObject::cast(current_map->prototype()));  in CheckPrototypes()
542     if (current_map->is_dictionary_map() &&  in CheckPrototypes()
543         !current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
544       DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.  in CheckPrototypes()
563         __ CheckMap(reg, map_reg, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
574       if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()
576       } else if (current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
598     current_map = handle(current->map());  in CheckPrototypes()
606     __ CheckMap(reg, scratch1, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
610   DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
611          !current_map->is_access_check_needed());  in CheckPrototypes()
612   if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()