Use SkTHashMap for the PipelineStageCodeGenerator.

Change-Id: I7b10f475598b070b1b690f38dc7d54b40f240f14
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/515676
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed