515   Handle<Map> current_map = receiver_map;  in CheckPrototypes()  local
519   while (!current_map.is_identical_to(holder_map)) {  in CheckPrototypes()
524     DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
525            !current_map->is_access_check_needed());  in CheckPrototypes()
527     prototype = handle(JSObject::cast(current_map->prototype()));  in CheckPrototypes()
528     if (current_map->is_dictionary_map() &&  in CheckPrototypes()
529         !current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
530       DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.  in CheckPrototypes()
557         __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
566       if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()
568       } else if (current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
583     current_map = handle(current->map());  in CheckPrototypes()
591     __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
595   DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
596          !current_map->is_access_check_needed());  in CheckPrototypes()
597   if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()