swift234

[ClangImporter] Ban a few deprecated methods of NSDocument.

...so that their modern NSError-based variants won't be imported using an
extra "error: ()" parameter. Apart from looking prettier, this avoids a
crash when overriding the "error: ()" versions, rdar://problem/21144509.

Once NS_REFINED_IN_SWIFT has been implemented we can probably use that instead.
Filed rdar://problem/21192039 to remove the hack at that point.

rdar://problem/21177341

Swift SVN r29212