Return/Throw/Rethrow all unconditionally exit the bytecode, so the
bytecode liveness analysis shouldn't merge their next bytecode's
liveness into them.

Change-Id: I62f53d16f2763e12a702b8b40b2573c264488968
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3439915
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78951}