Port acbdaa4c

Original Commit Message:

    Also remove some ifdefs since it is implemented on all architectures.

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

Change-Id: I2ec501c15dda5a0aa970b8b7d18a995e60f71b60
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2624747Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72046}