`vperm` indices are taken from the five least significant bits
of the input byte. We need to make sure bigger values
are saturated to 31 to make vperm select 0 as the output.

Change-Id: I74715e909e4a50dec23f5423e53254836fe0ff8e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2446553Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#70292}