In AVX, it is better to use the appropriate integer or floating point
moves depending on which instructions produce/consume these moves, since
there can be a delay moving from integer to floating point domain. On
SSE systems, it is less important, and we can move movaps/movups which
is 1 byte shorter than movdqa/movdqu.

This patch cleans up a couple of places, and defines macro-assembler
functions Movdqa, Movdqu, Movapd, to call into movaps/movups when AVX is
not supported.

Change-Id: Iba6c54e218875f1a70f61792978d7b3f69edfb4b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2599843
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71884}