add vcmpps

Change-Id: I7a13b759d2cd2c27c107ff4cec0daa15c2cd9edb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/253131
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Reed <reed@google.com>
3 files changed