Perform rect+path clip intersection in-place

https://skia-review.googlesource.com/c/skia/+/443897 regressed
the motionmarksuits.skp (180ms to 202ms on my machine). With this change
performance was brought back to 180ms.

Bug: skia:12398, chromium:1245485
Change-Id: Ib7e5776f1f9ab37f8681425e3972680bc547ed99
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/445236
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
1 file changed