Becca Royal-Gordon c4e152c2d0 Soften objcImpl implicit final errors to warnings ...

Before the change from @_objcImplementation to @objc @implementation, if a member was unrepresentable in ObjC, it would become implicitly `final`. After that change, this is now an error. We do want a diagnostic here, but we don’t want to break backwards compatibility for early adopters.

Soften the error to a warning when the old @objcImplementation syntax is used.

Fixes rdar://129247349.

2024-06-04 18:07:24 -07:00

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