Instead of letting swift_NSStringToString leak malloced memory, use swift_allocPOD to allocate storage for the converted String, and stash the heap object into the created string.
Swift SVN r7872
...rather than as a separate step. This avoids duplicating Parse and Sema
work for these. (This is the new and correct version of r7377.)
Also, remove leftover code for building "swift.swift" and friends in lieu
of proper modules. We're not going back to those days. :-)
Swift SVN r7420
It's used for class-bounded protocols, not just Foundation objects.
No test because I couldn't figure out how to write a non-compilation test.
Swift SVN r7367
