public boolean isUnconditionallyDereferenced(ValueNumber vn){
  return valueNumbersUnconditionallyDereferenced.get(vn.getNumber());
}

public boolean isUnconditionallyDereferenced ( ValueNumber vn ) { return valueNumbersUnconditionallyDereferenced . get ( vn . getNumber ( ) ) ; }
return whether or not the given value number is unconditionally dereferenced .
