micro simplification/speed-up to walk_edges

- quads (conics) are more common than cubics, so check that first
- don't need to track in_internval, so remove it

Don't expect any pixel differences

Bug: skia:
Change-Id: I6a6ce3f8a0b260da66ba27bb0b0d578fb8478cea
Reviewed-on: https://skia-review.googlesource.com/c/175590
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed