swift234

IRGen: Emit SIL class metatypes as Swift or ObjC.

Look at the uses of a SIL MetatypeInst to determine whether it is being used as a Swift metatype and/or ObjC class and emit the needed values. This avoids a costly trip wrapping and unwrapping ObjC Classes in a Swift metatype when they're just used to invoke class methods.

Swift SVN r4562