Implementation for PPC will be added in a later CL.

Port dd90d107

Original Commit Message:

    Code sequence from https://github.com/WebAssembly/simd/pull/379, and
    exactly the same as x64, with minor tweaks for
    ExternalReferenceAsOperand.

R=zhin@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: I2be8a9cf04d0b327c15f47c2575877925238353c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2672706Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#72510}