520   Handle<Map> current_map = receiver_map;  in CheckPrototypes()  local
524   while (!current_map.is_identical_to(holder_map)) {  in CheckPrototypes()
529     DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
530            !current_map->is_access_check_needed());  in CheckPrototypes()
532     prototype = handle(JSObject::cast(current_map->prototype()));  in CheckPrototypes()
533     if (current_map->is_dictionary_map() &&  in CheckPrototypes()
534         !current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
535       DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.  in CheckPrototypes()
558         __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
567       if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()
569       } else if (current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
590     current_map = handle(current->map());  in CheckPrototypes()
598     __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
602   DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
603          !current_map->is_access_check_needed());  in CheckPrototypes()
604   if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()