Port 89ea44bf

Original Commit Message:

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

R=victorgomes@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: I5a91f709f10065692ae654bdd79e6088e1fe88c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2697388Reviewed-by: Junliang Yan <junyan@redhat.com>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72780}