TypeInfo classes have wrong ClassKind, causing compilation errors.

[LunaTheFoxgirl]

Since LDC 1.42.0-beta1, the DtoIsObjcLinkage function appears to be returning true for TypeInfo classes, breaking dynamic up-casts of them.
I'm not sure where in the code the ClassKind is wrongfully being assigned to ClassKind::objc, maybe class initialization issue?

[kinke]

This sounds rather incredible to me, and that macOS would pass CI with such a bug. So please provide a minimal test case.