Tag build swift-DEVELOPMENT-SNAPSHOT-2017-02-09-a
Merge remote-tracking branch 'origin/swift-4.0-branch' into stable

* origin/swift-4.0-branch:
  Merging r293536: ------------------------------------------------------------------------ r293536 | dim | 2017-01-30 11:06:13 -0800 (Mon, 30 Jan 2017) | 27 lines