AST/Sema: Parse custom availability domains #78993
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For now `-enable-experimental-feature CustomAvailability` is required to accept this spelling, though.
A context is needed to customize the behavior of lookup in downstream versions of Swift.
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Introduce the
CustomAvailabilityexperimental feature and some frontend options that can be used to define custom availability domains. Also, tweak the parser to allow attributes like@available(SomeDomain). A future PR will wire up the custom availability domain definitions so that availability checking can use them.Resolves rdar://138441297.