Match opcodes proposed in https://github.com/WebAssembly/simd/pull/127,
and also move them into the list of MVP opcodes.

Bug: v8:10553
Change-Id: I02d839002673ac4aad3f863579607aaa17a52338
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2240489Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68311}