@Override
	public void clearDFA() {
		for (int d = 0; d < decisionToDFA.length; d++) {
			decisionToDFA[d] = new DFA(atn.getDecisionState(d), d);
		}
	}
Used during DFA/ATN exec to record the most recent accept configuration info
runtime/Java/src/org/antlr/v4/runtime/atn/LexerATNSimulator.java