// argument is a slice of *Nodes.
func (lv *liveness) pointerMap(liveout bitvec.BitVec, vars []*ir.Name, args, locals bitvec.BitVec) {
	var slotsSeen map[int64]*ir.Name
	checkForDuplicateSlots := base.Debug.MergeLocals != 0
	if checkForDuplicateSlots {
		slotsSeen = make(map[int64]*ir.Name)
	}
	for i := int32(0); ; i++ {
		i = liveout.Next(i)
		if i < 0 {
			break
		}
		node := vars[i]