Relocates them and their implementations to a header that can still be transitively included through absl/base/nullability.h but where they are less visible.
Prefer to use the macro nullability annotations instead (absl_nonnull, absl_nullable, and absl_nullability_unknown).
These will be removed after the next Long Term Support release.
PiperOrigin-RevId: 748689234
Change-Id: I33038678725f555b35b2f08dd0081e3cc11040db
The current spelling is inconsistent with standard casing rules: "nonnull" is a single word, not two.
PiperOrigin-RevId: 546034114
Change-Id: I04e5a204f4a74ebaa76031dd0b0874ca9cfa902c