ir.HIRInfo.SSADictionary = null;  ir.actualSSAOptions = null;
  final public void perform(OPT_IR ir) {    this.ir = ir;    translateFromSSA(ir);    branchOpts.perform(ir, true);    // reset ir.SSADictionary     ir.HIRInfo.SSADictionary = null;    // reset ssa options    ir.actualSSAOptions = null;  }