[cxx-interop] C++ reference types are not AnyObjects
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C++ foreign reference types have custom reference counting mechanisms, so they cannot conform to `AnyObject`. Currently Swift's type system treats C++ FRTs as `AnyObject`s on non-Darwin platforms, which is incorrect. This change makes sure the behavior is consistent with Darwin platform, i.e. a cast of C++ FRT to `AnyObject` is rejected by the typechecker. rdar://136664617
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This was referenced Sep 26, 2024
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C++ foreign reference types have custom reference counting mechanisms, so they cannot conform to
AnyObject.Currently Swift's type system treats C++ FRTs as
AnyObjects on non-Darwin platforms, which is incorrect. This change makes sure the behavior is consistent with Darwin platform, i.e. a cast of C++ FRT toAnyObjectis rejected by the typechecker.rdar://136664617