- Also changes in arm and ia32 for consistency
- Removes fall-through since MaybeOptimizeCode never returns

Change-Id: I115cff07c7d58ac3f7d0e0feeccbd6b1b172bd53
Bug: v8:11429
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2695392
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72764}