Sloppy repro of "mandatory folded edges" not being considered mandatory. #717
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An edge can be
@foldand also mandatory, if there's a statically-provable requirement that the@foldcount must be >= 1. But the current optimization hints system doesn't seem to consider this to be the case, which leads to missed optimizations.This is a somewhat sloppy repro of the problem, and a first step toward fixing it.