Simplify SkAAClip to use SkClipOp, not SkRegion::Op

Bug: skia:10205
Change-Id: I19039f72db1052db27f5819fafdc5ba8eb8af909
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/445618
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
6 files changed