These instructions were accepted into the proposal:
https://github.com/WebAssembly/simd/pull/290

Bug: v8:10972
Change-Id: Ia2cce2df575786babe770b043b1e90bf953c5f9b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2643658Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72243}