Tag build swift-DEVELOPMENT-SNAPSHOT-2017-01-27-a
Merge remote-tracking branch 'origin/swift-4.0-branch' into stable

* origin/swift-4.0-branch:
  Merging r293120: ------------------------------------------------------------------------ r293120 | compnerd | 2017-01-25 16:37:55 -0800 (Wed, 25 Jan 2017) | 3 lines