- Add v-flag and corresponding prototype getters.
- Update RegExp builtins fuzzer to handle two-byte flags.
- Update test262 status.

Bug: v8:11935
Change-Id: If649ebfacf1f933f3ae5c770c2240470a8b460ee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3868952Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Commit-Queue: Patrick Thier <pthier@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83003}