518   Handle<Map> current_map = receiver_map;  in CheckPrototypes()  local
522   while (!current_map.is_identical_to(holder_map)) {  in CheckPrototypes()
527     DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
528            !current_map->is_access_check_needed());  in CheckPrototypes()
530     prototype = handle(JSObject::cast(current_map->prototype()));  in CheckPrototypes()
531     if (current_map->is_dictionary_map() &&  in CheckPrototypes()
532         !current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
533       DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.  in CheckPrototypes()
556         __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
565       if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()
567       } else if (current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
588     current_map = handle(current->map());  in CheckPrototypes()
596     __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
600   DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
601          !current_map->is_access_check_needed());  in CheckPrototypes()
602   if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()