This CL refactors simd load/store to accept a scratch register
which will be used in macro-asm.

LE enforced versions of them is also introduced.

Change-Id: I97f4f4870d7889204b1d42cf50de85e234ecae36
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3765514Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#81757}