Tag build swift-DEVELOPMENT-SNAPSHOT-2017-02-01-a
Merge remote-tracking branch 'origin/swift-4.0-branch' into stable

* origin/swift-4.0-branch:
  Merging r292194: ------------------------------------------------------------------------ r292194 | majnemer | 2017-01-16 20:14:25 -0800 (Mon, 16 Jan 2017) | 8 lines
  Merging r293596: ------------------------------------------------------------------------ r293596 | ahatanak | 2017-01-30 18:31:39 -0800 (Mon, 30 Jan 2017) | 7 lines