Cl also optimizes the usage on Power9 by using
mtvsrdd.

Change-Id: Ibd6b227111adc0c262c621be6ce4068d3de2e659
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3060493Reviewed-by: Junliang Yan <junyan@redhat.com>
Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#76008}