DSLWriter now cleans up the changes it makes to IRGenerator

Change-Id: I83380bde91146b0b28365b76359cecea0d99da1c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/371196
Auto-Submit: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed