[Foundation] Workaround for importer NS_REFINED_FOR_SWIFT failure in development environments
[Foundation] Workaround for importer NS_REFINED_FOR_SWIFT failure in development environments

This is just a work-around for the underlying importer failure tracked by <rdar://problem/26921178>

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation