Simplify fRegenFlags

Change-Id: I2a7510f97dd8bdae4d5fbd2314718c14711a822a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260076
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Herb Derby <herb@google.com>
2 files changed