Add remove_pow_with_constant_exponent workaround

Bug: chromium: 477306, 829614
Change-Id: If88c57b15a4cfd6f362a2f5171f8e9c0775cb9d4
Reviewed-on: https://skia-review.googlesource.com/148480
Commit-Queue: Adrienne Walker <enne@chromium.org>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
9 files changed