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Allan Shortlidge
8a1338dfb2
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.