burs.mark(tn, (byte)1);
OPT_BURS_STATE.mark(tn, (byte)1);
  public void invoke (OPT_BasicBlock bb) {    OPT_BURS_STATE burs = new OPT_BURS_STATE(this);    for (OPT_InstructionEnumeration e = bb.forwardRealInstrEnumerator();         e.hasMoreElements();) {      OPT_Instruction s = e.next();      OPT_BURS_TreeNode tn = buildTree(s);      burs.label(tn);      burs.mark(tn, /* goalnt */(byte)1);      generateTree(tn, burs);    }  }