Allan Shortlidge 592b70f00f AST: Fix AvailabilityContext platform range for certain targets. ...

https://github.com/swiftlang/swift/pull/79807 caused a regression in which
`AvailabilityContext` stopped tracking the available version range for the
active platform domain for certain platforms. Fix this by reverting to checking
`AvailabilityDomain::isActive()` to determine when a given platform
`AvailabilityDomain` represents the target platform. The compiler's existing
mapping from target triple to platform domain is incomplete and it's not clear
to me whether fixing that could cause other regressions.

Resolves rdar://147413616.

2025-03-20 16:26:54 -07:00

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