value must be written to memory in LE order on BE machines
as they will be loaded in reverse when emitting S128Const.

Change-Id: Ia1d6c784505abe499fb71a6d86daea2721615da4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3151956Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#76758}