Propagate trapz backwards from ref.cast into the branch-y instance-of check that it emits #13485
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Propagate
trapz backwards from ref.cast into the branch-y instance-of check that it emits #13485
Propagate
trapzbackwards fromref.castinto the branch-y instance-of check that it emits. Similar for the jumps inside abr_on_cast[_fail]'s instance-of check. See #9437 (comment) for details. Alternatively, clean this stuff up in the mid-end: #6106