Due to the lane numbering difference between Intel and IBM machines,
we need to switch the input registers when doing a vector pack.

Change-Id: I40e1fdae308e5dcd67aafab2abf099d4be0bb1a2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2450832Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#70327}