Joe Groff 27f49cd19d Runtime: Optional-like enums with single-refcounted payloads can share the refcounted value witnesses. ...

swift_retain and objc_retain both handle nil already, so we can bypass the generic Optional value witnesses when instantiating Optional on a class type, which happens kind of a lot.

Swift SVN r23613

2014-12-02 17:34:36 +00:00

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