swift 2.12.0 release

meta:version: 2.12.0
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: John Dickinson <me@not.mn>
meta:release:Commit: John Dickinson <me@not.mn>
meta:release:Change-Id: Id377daec2f98ea3e8901e259ce9ef275d69b1e38
meta:release:Code-Review+2: Davanum Srinivas (dims) <davanum@gmail.com>
meta:release:Workflow+1: Davanum Srinivas (dims) <davanum@gmail.com>
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