final void removeSuccs() {
		if (succs == null)
			return;
		if (succs instanceof Instruction[]) {
			Instruction[] ss = (Instruction[]) succs;
			for (int i = 0; i < ss.length; i++)
				if (ss[i] != null)
					ss[i].removePredecessor(this);
		} else
			((Instruction) succs).removePredecessor(this);
		succs = null;
	}