Most tests were using %swift or similar substitutions, which did not
include the target triple and SDK. The driver was defaulting to the
host OS. Thus, we could not run the tests when the standard library was
not built for OS X.
Swift SVN r24504
system has been "solved", meaning that all type variables have been
bound to concrete types or are completely free. Add the solvedness of
a particular system to the debug output.
Start adding some simple test cases.
Swift SVN r2706
