[stdlib] Construct String from NSString, publicly!
[stdlib] Construct String from NSString, publicly!

Yes, we do need a straightforward way to do this.

Swift SVN r20897

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