565   Handle<Map> current_map = receiver_map;  in CheckPrototypes()  local
569   while (!current_map.is_identical_to(holder_map)) {  in CheckPrototypes()
574     DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
575            !current_map->is_access_check_needed());  in CheckPrototypes()
577     prototype = handle(JSObject::cast(current_map->prototype()));  in CheckPrototypes()
578     if (current_map->is_dictionary_map() &&  in CheckPrototypes()
579         !current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
580       DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.  in CheckPrototypes()
605         __ CheckMap(map_reg, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
614       if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()
617       } else if (current_map->IsJSGlobalObjectMap()) {  in CheckPrototypes()
633     current_map = handle(current->map());  in CheckPrototypes()
642     __ CheckMap(reg, scratch1, current_map, miss, DONT_DO_SMI_CHECK);  in CheckPrototypes()
646   DCHECK(current_map->IsJSGlobalProxyMap() ||  in CheckPrototypes()
647          !current_map->is_access_check_needed());  in CheckPrototypes()
648   if (current_map->IsJSGlobalProxyMap()) {  in CheckPrototypes()