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The new structurizer therefore reaches feature parity with the older simple one, except for a couple of points: * the old structurizer accepts any CFG, without requiring reducibility; however, the DXIL specification requires the CFG to be reducible anyway, so we're not really losing anything; * the new structurizer additionally requires that no block has two incoming back arrows; AFAIK this is condition that can happen, but in practice it seems to be rare; also, it's not hard to add support for it, as soon as it is decided it is useful. On the other hand, the new structurizer makes use of the merging information that are reconstructed from the CFG, which is important for downstream optimization and fundamental for correctly emitting tangled instructions. Taking these considerations into account, the old structurizer is considered superseded and is therefore removed.