int label = bb.getLabel();
sb.append("block ");
sb.append(Hex.u2(label));
sb.append("\n");
IntList preds = rmeth.labelToPredecessors(label);
int psz = preds.size();
for (int j = 0; j < psz; j++) {
sb.append(" pred ");
sb.append(Hex.u2(preds.get(j)));
sb.append("\n");