[runtime] Fix MapUpdater::TryUpdateNoLock()

Return empty optional instead of optional with empty Map on failure.

Bug: v8:7790, chromium:1323119
Change-Id: I1e6e9e2361d12d0f8d106a7929221d3116d0d547
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3650715
Auto-Submit: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80564}

src/objects/map-updater.cc

@@ -366,7 +366,7 @@ base::Optional<Map> MapUpdater::TryUpdateNoLock(Isolate* isolate, Map old_map,
     info = DetectIntegrityLevelTransitions(old_map, isolate, &no_gc, cmode);
     // Bail out if there were some private symbol transitions mixed up
     // with the integrity level transitions.
-    if (!info.has_integrity_level_transition) return Map();
+    if (!info.has_integrity_level_transition) return {};
     // Make sure to replay the original elements kind transitions, before
     // the integrity level transition sets the elements to dictionary mode.
     DCHECK(to_kind == DICTIONARY_ELEMENTS ||