Slava Pestov 765ce78992 Sema: Downgrade potentially unavailable enum cases to a warning in module interfaces ...

There are two pieces here:

- A -warn-on-potentially-unavailable-enum-case flag is passed down by
  the driver when *producing* a swiftinterface

- When *consuming* a swiftinterface, also enable this behavior

Part of rdar://problem/78306593.

2021-06-08 23:38:35 -04:00

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