SILGen: Don't call _diagnoseUnavailableCodeReached() from already unreachable functions #68874
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…eachable functions. We must avoid emitting applies of `_diagnoseUnavailableCodeReached()` in function bodies that are already marked unreachable since there isn't a valid insertion point once an `unreachable` instruction has been emitted. A function body may be marked unreachable if, for example, the parameters of the function are uninhabited. Resolves rdar://116246677
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@swift-ci please smoke test |
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We must avoid emitting applies of
_diagnoseUnavailableCodeReached()in function bodies that are already marked unreachable since there isn't a valid insertion point once anunreachableinstruction has been emitted. A function body may be marked unreachable if, for example, the parameters of the function are uninhabited.Resolves rdar://116246677