swift234

[QoI] Don't emit @objc Fix-Its for cases where @objc will be inferred from a requirement.

This is a follow-up to the change that allowed one to omit @objc (or
the name in an @objc) when it can be inferred by matching a
requirement. There is no point in suggesting that one add @objc if it
will be inferred anyway, since it's just syntactic noise.