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 ensures that the brace range will include all contained items.
The previous scheme of choosing the end location of the last item was not accurate because for pattern bindings decls
we also push the var decls as items, but they don't have the full source range of the pattern binding decl.
Fixes rdar://15190792.
Swift SVN r9293
