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
This keeps CInt (and related type aliases) in the stdlib, and keeps the clang importer
using them, but has it look through one level of the type alias to get to the underlying
type.
The upshot of this is that we now import things like exit (as a random example) as
"func exit(Int32)" instead of "func exit(CInt)".
Swift SVN r19224
