swift234

PrintAsObjC: Stop avoiding using parameterized Foundation collections.

The macro hackery here was staging while we waited for Foundation's
parameterized collections to percolate through the system, then I
forgot about it. Eliminate the hackery so the Objective-C view of
Swift APIs actually produces specialized types such as
NSArray<NSString *> *.

Fixes rdar://problem/20984336.

Swift SVN r28650