This CL also adds and makes use of the __int128 data type to help
with vector loads and stores.

Change-Id: I0d02eddcedfe17d12eadd214e205b693fa7ebe53
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2720459Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73059}