Skip non-AA intersect rects in GrReducedClip

Skips non-AA rects whose op is intersect or replace, and who do not
precede elements that grow the clip, by tightening fIBounds.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2271493002

Review-Url: https://codereview.chromium.org/2271493002
2 files changed