{- -------------------------------------------
  (1) instanceKlass::get_jmethod_id() を呼び出して, 結果をリターンするだけ.
      ---------------------------------------- -}

      // Get this method's jmethodID -- allocate if it doesn't exist
      jmethodID jmethod_id()                            { methodHandle this_h(this);
                                                          return instanceKlass::get_jmethod_id(method_holder(), this_h); }