This reverts commit 7d955faa.

Reason for revert: Bad change, modified wrong test file https://ci.chromium.org/p/v8/builders/ci/V8%20Linux/36416

Original change's description:
> [wasm-simd][x64][ia32] Do not overwrite input register
> 
> We are ovewriting input register (contains the shift) when we are
> masking it, instead, move to a temporary,then mask it.
> 
> Bug: chromium:1065599
> Change-Id: Iab72b94581239447e444746681387350b576e24a
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2125941
> Commit-Queue: Zhi An Ng <zhin@chromium.org>
> Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#66997}

TBR=gdeepti@chromium.org,zhin@chromium.org

Change-Id: I50c57906d6eb49758584b477c971179ea3c6e5d3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:1065599
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2134655Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67000}