Commits
Doug Gregor committed 1a2c0b063ef
[Clang importer] Be more careful when stripping module prefixes.
Clean up our handling of the removal of the "NS" prefix from
Foundation-defined entities in a few ways:
* If the "NS" is followed by a "_", strip that too
* Make sure that the result is still an identifier ("NS123" shouldn't
become "123"!)
* Don't lowercase ALL_CAPS_NAMES