Remove unused fields from SkSL's IRGenerator

Change-Id: If2a05c1bdf6ed1bee2244c9721307c7906acda94
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/270202
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2 files changed