After https://crrev.com/c/2831872 Baseline and Compare_Baseline
functions need to return proper registers as placeholders.

More details can be found on comment section of this port:
https://crrev.com/c/2830897

Change-Id: I7f91a85f9c85ce1813540b4d525f2dce5faaf279
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2836705Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74047}