AST/Sema: Introduce AvailabilityContext
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This class is designed to be a compact representation of the active availability constraints in a specific scope. For now, it only models platform introduction availability but it will soon be updated to cover additional availability constraints, like platform unavailability. In anticipation of needing to reference `AvailabilityContext`s from `TypeRefinementContext`s and increasing memory requirements for these contexts, a cache of uniqued instances of `AvailabilityContext` are stored in a `llvm::FoldingSet` on `ASTContext`.
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Begin using `AvailabilityContext` as the availability representation in `TypeRefinementContext`, instead of only storing platform introduction availability ranges. There should be no functional changes since this just changes the representation of the existing information stored by `TypeRefinementContext`. However, in the future `AvailabilityContext` will be expanded to represent additional availability constraints.
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AvailabilityContextis designed to be a compact representation of the active availability constraints in a specific scope. For now, it only models platform introduction availability but it will soon be updated to cover additional availability constraints, like platform unavailability.TypeRefinementContextnow represents availability constraints usingAvailabilityContextinstead of just anAvailabilityRangerepresenting only platform introduction versions. In anticipation of the memory requirements forAvailabilityContextgrowing, a cache of uniqued instances ofAvailabilityContextare stored in allvm::FoldingSetonASTContext.There should be no functional changes since this just changes the representation of the existing information stored by
TypeRefinementContext. However, in the futureAvailabilityContextwill be expanded to represent additional availability constraints.