swift 2.23.1 release

meta:version: 2.23.1
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Tim Burke <tim.burke@gmail.com>
meta:release:Commit: Tim Burke <tim.burke@gmail.com>
meta:release:Change-Id: Ia911882e80a35da4f05fae10e07eacd9d5123144
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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