This is a reland of 0ef2eea7

The fixes are adding missing SSE4_1 scopes to ia32. I realize
the x64 codegen is missing the scopes to, so fix them as well.

Original change's description:
> [wasm-simd][ia32] Optimize some signed integer widening sequences
>
> Optimize ia32 code sequences. This is the same sequences as x64, which
> have been optimized based on supported extensions.
>
> Bug: v8:11464
> Change-Id: I10396a928a431cdd2de9b22bb8a395bc0adb4694
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2704897
> Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
> Commit-Queue: Zhi An Ng <zhin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#72926}

Bug: v8:11464
Change-Id: Ib66a63de26bcc3bb3626922b642fe5df6bff8bdb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2713211Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72983}