Alexis Laferrière fd78da5137 [ModuleInterface] Don't print extensions to implementation-only imported types ...

Extensions to implementation-only types are accepted at type-checking
only if they don't define any public members. However if they declared a
conformance to a public type they were also printed in the
swiftinterface, making it unparsable because of an unknown type.

Still accept such extensions but don't print them.

rdar://problem/67516588

2020-08-20 17:12:31 -07:00

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