527   Handle<Map> current_map = receiver_map;  in CheckPrototypes()  local
531   while (!current_map.is_identical_to(holder_map)) {  in CheckPrototypes()
536     DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
537            !current_map->is_access_check_needed());  in CheckPrototypes()
539     prototype = handle(JSObject::cast(current_map->prototype()));  in CheckPrototypes()
540     if (current_map->is_dictionary_map() &&  in CheckPrototypes()
541         !current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
542       DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.  in CheckPrototypes()
567         __ CheckMap(reg, map_reg, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
578       if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()
580       } else if (current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
596     current_map = handle(current->map());  in CheckPrototypes()
604     __ CheckMap(reg, scratch1, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
608   DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
609          !current_map->is_access_check_needed());  in CheckPrototypes()
610   if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()