Use movsd/vmovsd instead of pblendw/vpblendw. It is two bytes shorter,
and avoids mixing integer and floating-point domain instructions.

Bug: v8:12074
Change-Id: Ia41072fbf8da7d99618a55d59634f7399a7105ce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3088358Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76287}