Jordan Rose 5c1967397b Update and re-enable the diagnostics for unstable runtime names. ...

This time, the warnings only fire when the class in question directly
conforms to NSCoding. This avoids warning on cases where the user has
subclassed something like, oh, UIViewController, and has no intention
of writing it to a persistent file.

This also removes the warning for generic classes that conform to
NSCoding, for simplicity's sake. That means
'@NSKeyedArchiverEncodeNonGenericSubclassesOnly' is also being
removed.

Actually archiving a class with an unstable mangled name is still
considered problematic, but the compiler shouldn't emit diagnostics
unless it can be sure they are relevant.

rdar://problem/32314195

2017-06-05 17:32:26 -07:00

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