swift234

PrintAsObjC: Print @objc enums.

Predefine a SWIFT_ENUM macro that expands the same as NS_ENUM, but which we can use to recognize Swift-defined @objc enums that are imported back. Print enums as ObjC using this SWIFT_ENUM macro.

We currently don't serialize the raw value exprs of enums, so we fail to correctly bring raw values from the enum declaration to the ObjC version.

Swift SVN r23422