Joe Groff 950ee3b0de IRGen: Generalize the nullable optimization for single-payload enums. ...

Augment the `isSingleRetainablePointer` check that allows IRGen to avoid adding branching around retain/release operations on enums that use the null pointer extra inhabitant with a more general "can value witness extra inhabitants" method on TypeInfo, which says whether a type's retain/release operations are safe to invoke on some or all of its extra inhabitants. This lets us generalize the optimization to include things like `String?` or `ClassProtocol?` which are common types with a nullable pointer in them.

2020-03-03 15:00:27 -08:00

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