[swift-dev] [Swift 2.2] [PrintAsObjC] Use @objc name for enums in enum references

[Kevin Ballard]

This is a fix for a bug introduced as part of a Swift 2.2 feature (better @objc support on enums). I'd love to get it cherry-picked into Swift 2.2.

https://github.com/apple/swift/pull/1246

-Kevin Ballard