SkRasterPipelineBlitter: blitAntiH + full coverge --> blitH

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4442

Change-Id: Iaf3da7b82c1b3a41fe66c83fb5f9ca589f64851f
Reviewed-on: https://skia-review.googlesource.com/4442
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed