This runs all files that have a target-build-swift or target-run-stdlib-swift RUN line in optimize test mode. Swift SVN r29206
Also removed the sdk 'feature' in favour of the more specific objc_interop. Swift SVN r24856
Non-null attributes can indicate non-optionality of pointers. While these non-null attributes are generally less useful than the nullability type specifiers, they are occasionally used in the wild. Addresses rdar://problem/18428099. Swift SVN r23733
Swift SVN r20050