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 r293629: ------------------------------------------------------------------------ r293629 | sbaranga | 2017-01-31 06:04:15 -0800 (Tue, 31 Jan 2017) | 15 lines
  Merging r292117: ------------------------------------------------------------------------ r292117 | sdardis | 2017-01-16 05:55:58 -0800 (Mon, 16 Jan 2017) | 14 lines
  Merging r292624: ------------------------------------------------------------------------ r292624 | petarj | 2017-01-20 09:53:30 -0800 (Fri, 20 Jan 2017) | 9 lines
  Merging r293417: ------------------------------------------------------------------------ r293417 | jhibbits | 2017-01-28 20:55:57 -0800 (Sat, 28 Jan 2017) | 16 lines
  Merging r293522: ------------------------------------------------------------------------ r293522 | bogner | 2017-01-30 10:29:46 -0800 (Mon, 30 Jan 2017) | 8 lines