// TODO: if the output parameter is heap-allocated, then we
	// don't need to keep the stack copy live?
	if lv.fn.HasDefer() {
		for i, n := range lv.vars {
			if n.Class == ir.PPARAMOUT {
				if n.IsOutputParamHeapAddr() {
					// Just to be paranoid.  Heap addresses are PAUTOs.
					base.Fatalf("variable %v both output param and heap output param", n)
				}
				if n.Heapaddr != nil {