Brent Royal-Gordon 9d4281b46b Support generic @compatibility_alias in PrintAsObjC ...

When @compatibility_alias is used with an ObjC generic class, this ends up importing as a generic typealias. PrintAsObjC previously didn’t handle declarations involving these types correctly; it would fail an assertion in asserts compilers, and potentially print an incorrect compatibility header in non-asserts compilers.

This PR makes it so that PrintAsObjC can now correctly use generic typealiases imported from Objective-C modules. It is, of course, still not possible to declare a generic typealias in Swift that will be printed into the Objective-C header.

Fixes rdar://67256866.

2020-08-20 16:21:50 -07:00

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