Tag build swift-DEVELOPMENT-SNAPSHOT-2016-09-19-a
Merge remote-tracking branch 'origin/swift-3.1-branch' into stable

* origin/swift-3.1-branch:
  [analyzer] Fix HTMLRewriter style sheets to support non-webkit browsers.
  [analyzer] scan-build-py: Remove relative path hack for SATestsBuild.py
  [analyzer] Fix ExprEngine::VisitMemberExpr