Jordan Rose f0aca936c7 Allow '@objc(RuntimeName)' on classes with generic ancestry. ...

This is accomplished by recognizing this specific situation and
replacing the 'objc' attribute with a hidden '_objcRuntimeName'
attribute. This /only/ applies to classes that are themselves
non-generic (including any enclosing generic context) but that have
generic ancestry, and thus cannot be exposed directly to Objective-C.

This commit also eliminates '@NSKeyedArchiverClassName'. It was
decided that the distinction between '@NSKeyedArchiverClassName' and
'@objc' was too subtle to be worth explaining to developers, and that
any case where you'd use '@NSKeyedArchiverClassName' was already a
place where the ObjC name wasn't visible at compile time.

This commit does not update diagnostics to reflect this change; we're
going to change them anyway.

rdar://problem/32414557

2017-06-05 17:32:25 -07:00

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