AST/Sema: Diagnose references to permanently enabled availability domains #84454
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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 aboutif #available
queries that always return true because they check a permanently enabled domain.Resolves rdar://157601761.