Chris Lattner 40242d323d rework PatternMatchEmission::emitSharedCaseBlocks to avoid emitting empty blocks ...

(containing just an uncond branch) when a shared block isn't actually shared.

This is a revised version of r26676 that makes sure to emit the cleanups for a
case pattern as soon as possible.  Extending the lifetime of the case value
across the body of the switch caused extra copies of COW types.


Swift SVN r26685

2015-03-28 22:12:49 +00:00

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