save only xmm6-15 on windows

Just a little follow up, adding a mem->xmm vmovups
instruction to make it possible.  Nothing tricky.

Change-Id: I319e11839e44ccda46e664c82fb858a18499f9be
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/299883
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Herb Derby <herb@google.com>
3 files changed