swift

6850a0ef - [AutoDiff] Fix `@differentiating` type-checking for differentials. (#23353)

[AutoDiff] Fix `@differentiating` type-checking for differentials. (#23353) * [AutoDiff] Fix `@differentiating` type-checking for differentials. Fix type-checking for differential functions. Simplify pullback/differential type-checking diagnostics. Resolves TF-366. * Revamp differential/pullback type mismatch diagnostics. - Revamp differential/pullback type mismatch diagnostics. - Emit type mismatch error on `@differentiating` attribute. - Emit note with expected differential/pullback type on actual type location. - Emit note showing original function location, if possible. - Perform original function lookup before checking `wrt` parameters. - Change error message for `differentiating_attr_overload_not_found`.