Improve class hierarchy support #3212
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While working on futures, I noticed that WinRT classes whose default interface isn't exclusive aren't quite represented most optimally. This is a pretty niche type system issue but it helps simplify a few internals both here and in a subsequent update around futures and async support.
Basically, in such cases the non-exclusive default interface moves from the
required_hierarchymacro to theinterface_hierarchymacro as part of code generation. This means that such casts can be performance without callingQueryInterface.