These were originally proposed as a part of the fixed-width SIMD
proposal, and were then migrated to the relaxed-simd proposal
which also deems these operations out of scope.

Github issue: https://github.com/WebAssembly/relaxed-simd/issues/4

Bug: v8:12284
Change-Id: I65ceb6dfd25c43cf49bd7ec5b5ecd6b32cc3516a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3595970Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80125}