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Older compilers that we aim to support with textual interfaces don't understand
@expression
but do understand$Macros
so falling back to@expression
when$FreestandingExpressionMacros
is not available causes a condfail. Revert #64269 and just require users to have a relatively recent compiler if they want to work with the expression macros in the standard library.Resolves rdar://108591384