public static BitSet getAlts(ATNConfigSet configs) {
		BitSet alts = new BitSet();
		for (ATNConfig config : configs) {
			alts.set(config.alt);
		}
		return alts;
	}
Get union of all alts from configs.

@since 4.5.1
runtime/Java/src/org/antlr/v4/runtime/atn/PredictionMode.java