fix op fuzz

fixes the current four fuzzer fails by rewriting
asserts as function exits. Passes all extended
pathops testing.

To run the extended tests:
./out/debug/pathops_unittest -V -x
./out/release/pathops_unittest -V -x

R=kjlubick@google.com

Docs-Preview: https://skia.org/?cl=114962
Bug: skia:
Change-Id: I05bd368a87b38b1121403cf93b21caf76c2e7d7e
Reviewed-on: https://skia-review.googlesource.com/114962
Commit-Queue: Cary Clark <caryclark@skia.org>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
3 files changed