swift234

Introduce a simple demo program that uses Clang-imported Objective-C modules.

This demo program illustrates how we can use imported Clang modules to
operate on Objective-C classes from Swift. The 'Foundation' module is
imported from Clang directly, while the 'SwiftFoundation' module adds
extensions to String and NSString to allow conversion in both
directions, as well as make NSString string-literal'able. The demo
program illustrates the use of these modules together fairly
cleanly.

At present, this only builds with CMake. To enable building the demo,
you'll need to install my hacked modules SDK at the standard location
or change the MODULES_SDK setting to point at the hacked modules
SDK. Makefile support will come a bit later.



Swift SVN r3288