This reverts commit 7e7c1b10.

Reason for revert: https://logs.chromium.org/logs/v8/buildbucket/cr-buildbucket.appspot.com/8910673611629290864/+/steps/OptimizeForSize/0/logs/RunWasm_S16x4Reverse_simd_lowered/0
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=sigurds@chromium.org,tebbi@chromium.org

Change-Id: Ic26376c9fe28e7e74cbdb1fa9ec2f7627d2adeee
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7517, v8:9183
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1660609Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62180}