Make NSObject conform to CustomDebugStringConvertible
Make NSObject conform to CustomDebugStringConvertible

NSObject vends a debugDescription member, but it was not marked accordingly in the overlay



Swift SVN r32904

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation