Optimize away logical-not applied to a comparison op.

We are now able to convert `!(a < b)` into `(a >= b)`, or convert
`!(a == b)` into `(a != b)`.

Bug: skia:14369
Change-Id: I8ca1d5e48c09a8b906d1ef21c2a3617cbf3461ab
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/709017
Reviewed-by: Arman Uguray <armansito@google.com>
Commit-Queue: Arman Uguray <armansito@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
27 files changed