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This was the actual bug. When EliminateRedundantPhis eliminates a phi, it has to rewrite downstream usages of the phi id to the single operand id. We were correctly doing that in all but one place. When we iterate _downstream phis_, we were looking up the operands against the rewrite table, but not updating the phi operands themselves to the rewritten value. This fixes the bug, and incidentally fixes a test that has been broken for a while and nagging at me.