This CL optimizes ByteReverse 16/32/64 ops on PPC<10 as
well as PPC_10_PLUS.

A 32bit sign extension is also added to `ByteRev32` in codegen.

Change-Id: I6379ac4222f3574ab226971546238142039fe977
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3298308
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#78048}