ccpr: Improve CPU checks for collinear points

Bug: skia:
Change-Id: I1373b5e9740538b2bc5c1b33644b7ec5dfadc95c
Reviewed-on: https://skia-review.googlesource.com/119982
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed