cbsReg = ir.regpool.makeTempInt();
  private static void performVariationNoDuplication(OPT_IR ir) {    Vector v = new Vector();    for (OPT_BasicBlockEnumeration allBB = ir.getBasicBlocks(); 	 allBB.hasMoreElements(); ) {      OPT_BasicBlock bb = allBB.next();      for (OPT_InstructionEnumeration ie	     = bb.forwardInstrEnumerator();	   ie.hasMoreElements();) {	OPT_Instruction i = ie.next();			// If it's an instrumentation operation, remember the instruction 	if (isInstrumentationInstruction(i))	  v.add(i);      }    }    // for each instrumentation operation.    Enumeration e = v.elements();    while (e.hasMoreElements()) {      OPT_Instruction i = (OPT_Instruction)e.nextElement();      OPT_BasicBlock bb = i.getBasicBlock();      conditionalizeInstrumentationOperation(ir,i,bb);    }  }