- Use movhlps instead of pshufd if dst == src
- use xorps with punpckhdq instead of two shuffles

Bug: v8:11470
Change-Id: I50f77b8591372cccca48b9a6078fc3132fe48a2f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2773902Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73527}