[cxx-interop][serialization] resolve x-refs to instantiated/synthesiz… #74524
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…ed C++ iterator conformance operators
These x-refs are not resolvable using regular lookup from the 'std' module as they're instantiated by the clang importer, and thus they need a different lookup path in order to get resolved. The new lookup uses the clang importer logic that is used during the conformance to the C++ iterator protocol.