This reverts commit 387d85ad.

Reason for revert: Broke ARM tree https://ci.chromium.org/p/v8/builders/ci/V8%20Arm%20-%20debug/13926?

Original change's description:
> [wasm-simd][liftoff][arm][arm64] Implement integer narrowing
> 
> Bug: v8:9909
> Change-Id: I0664df45fe399bfa018ff8bcacdbdae66944ed29
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2154834
> Reviewed-by: Clemens Backes <clemensb@chromium.org>
> Commit-Queue: Zhi An Ng <zhin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67254}

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

Change-Id: I6e5cac9cf9e6070b4819edbde6cd2ada2d0b476a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:9909
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2158010Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67256}