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
Instead of writing in an awkward special case for SemiStmt in ParseStmt, apply the existing semicolon-eating syntax in ParseDecl for types to the toplevel. Suggested by Jordan re: r3336.
Swift SVN r3342
