Follow-up to dfca6c0d3bf9d1a056 to extend isUnrolled handle any unrolled VPlan, which means there's a single UF, but it will be > 1 if unrolling took place.
Follow-up to dfca6c0d3bf9d1a056 to extend isUnrolled handle any unrolled VPlan, which means there's a single UF, but it will be > 1 if unrolling took place.