This is a reland of 7e7c1b10

Original change's description:
> [cleanup] Add operator parameter accessor for S8x16Shuffle
>
> Bug: v8:7517, v8:9183
> Change-Id: Ic9beade6893b81aaa77f9c634cbeb7444260907b
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/973375
> Auto-Submit: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#62177}

TBR=tebbi@chromium.org

Bug: v8:7517, v8:9183
Change-Id: Ia72d73416b2d6b8e7e2fba97cfce39e4ab387a08
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1660610
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62186}