swift234

API Notes: Correct audit errors

 - Mark more initializers as non-optional.
    <rdar://problem/18559511> Audit the list of UIKit symbols that marked as returning optional
    <rdar://problem/18559660> Audit the list of AppKit symbols that marked as returning optional
    <rdar://problem/18559676> Audit the list of Foundation symbols that marked as returning optional
    <rdar://problem/18559730> Audit the list of Scenekit symbols that marked as returning optional
 - NSMenu.popUpMenuPositioningItem (radar://18505688)
 - Remove NSXMLParserDelegate audit since it leads to crashes (radar://18227344)
 - UICollectionViewController collectionView should not be optional (radar://18508177)

Swift SVN r22570