Thunks above the natural uncurry level of a function should always be emitted with standalone function CC instead of method or foreign CC. Partially addresses <rdar://problem/14687373>, but we still don't emit thunks for struct instance methods.
Swift SVN r8043
We haven't fully updated references to union cases, and enums still are not
their own thing yet, but "oneof" is gone. Long live "union"!
Swift SVN r6783
"SILConstant" doesn't really describe its role in SIL anymore, which is to provide a reference to a Swift declaration in a SIL instruction, such as a method or nominal type field.
Swift SVN r6559
