Remove rewrite of `true ^^ expr` to `!expr`.

This optimization doesn't perceptibly improve the generated code; it
just replaces a binary expression with an equivalent unary one.

Change-Id: Ib6cd2732a22c26978665c57ee00d7b5e5d0a0aee
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/352123
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
4 files changed