Simd implementations on Power need P9 at a minimum.
Feature is enabled on the simulator regardless of the host.

Change-Id: I06bbfea11615457f5d837fe00c3dfe36b277d82b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2787490Reviewed-by: Junliang Yan <junyan@redhat.com>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73726}