message: modify ex3p so show the memory leak, and show that this fixes it.
diff: @@ -244,6 +244,10 @@ int main(int argc, char *argv[])
  pcg.SetMaxIter(500);
  pcg.SetPrintLevel(2);
  pcg.SetPreconditioner(ams);
  + pcg.SetOperator(*A.As<HypreParMatrix>());
  + pcg.Mult(B, X);
  +
  + pcg.SetOperator(*A.As<HypreParMatrix>());
  pcg.Mult(B, X);
  }
  