Doug Gregor 7015543c9c [Module interfaces] More aggressively #if-out declarations. ...

Extend the checks for marker protocols and rethrows protocols to ensure
that we #if out more code that relies on them in module interface
generation. This makes the _Concurrency module parseable by much older
compilers.

Fixes rdar://75291705.

2021-03-11 22:03:29 -08:00

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