swift234

[ClangImporter] Typedefs of CFTypeRef should not be imported as AnyObject.

...or rather, typealiases of AnyObject. They should be typealiases of
CFTypeRef. (The problem is that everywhere else CFFooRef becomes a typealias
for CFFoo, but we don't do the same with 'CFType'.)

Fixes a PrintAsObjC problem where we'd try to mark such typealiases as
'strong' if they show up in the generated ObjC header.

rdar://problem/22827172

Swift SVN r32230