Some of these functions will be reused by Liftoff. Move them into
simd-shuffle for sharing (even though these only apply to ia32 and x64).

Bug: v8:10696
Change-Id: Ib83a2fcd443f93f86d7a4c85898205edb8c3925c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2330796Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69180}