x86, load16

Very similar to load8.

The only interesting thing is how different vpinsrw is from vpinsrb (and
vpinsrd and vpinsrq)... different map of instructions entirely.

Change-Id: Ia413b83604dd2d277d59495c5f693f505c35be9f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/232058
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
3 files changed