swift

3aa48f1d - [Type checker] Warn deprecated @objc used to satisfy protocol requirements.

[Type checker] Warn deprecated @objc used to satisfy protocol requirements. Warn about uses of declarations which have inferred @objc due to the deprecated Swift 3 rules when the declarations are used to satisfy a requirement of an @objc protocol. This covers cases where the @objc cannot be inferred due to the conformance, e.g., when the declaration itself is in a superclass but a subclass is stating the conformance. Fixes rdar://problem/32431838. (cherry picked from commit c96da6800acf617c8c17dde99a95865348c9ca5a)