Avoid this-instantiation if not necessary for checking relationship #28263
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Fixes #28231
I don't have a condensed repro for the perf issue, since it needs a large, deep, this-using type heirarchy to make the perf issue apparent (and even then, we don't regression test perf well). I suppose we could add the reported repro to the
usersuite, but that still won't track any kind of perf data over time.