Allan Shortlidge 8a1338dfb2 AST/Sema: Diagnose references to permanently enabled availability domains ...

A "permanently enabled" availability domain is one that has been declared
always available and is also simultaneously has either an attribute that
makes it deprecated or universally unavailable.

Emit fix-its that remove (or update) `@available` attributes that restrict
availability in a permanently enabled domain. Also, emit warnings about
`if #available` queries that always return true because they check a
permanently enabled domain.

Resolves rdar://157601761.

2025-09-22 17:48:55 -07:00

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