Reference instruction lowerings are in the corresponding issue:
https://github.com/WebAssembly/relaxed-simd/issues/40

Lowers directly to Pmulhrsw in the macro assembler as we use
DefineSameAsFirst in place of the Movdqa on non-AVX hardware

Bug: v8:12609, v8:12284
Change-Id: I6de45a2d8895637f895d3b0cc68f5dd1f67f77aa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3837853Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82571}