Make fBrokenRun local to doRegen.

If doRegen is called and fCurrGlyph > 0, this implies that the previous call
to doRegen exited early on a code == GrDrawOpAtlas::ErrorCode::kTryAgain.
We can calculate brokenRun directly from the fact doRegen is called with
fCurrGlyph > 0.

Change-Id: I1ee7b88e59708ae329c2204c1d7779a295cd9d33
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/262378
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed