Simplify GrPipeline::genKey.

This code contained lots of handcrafted bit-packing logic, but
GrProcessorKeyBuilder already knows how to pack bits for us.

Change-Id: Ia076524db99b5a56de08dc829600d32fecc1d456
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/415896
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
1 file changed