bool ParallelScavengeHeap::is_in_reserved(const void* p) const {

  {- -------------------------------------------
  (1) 引数のポインタが, New 領域か Old 領域か Perm 領域の中にあれば true.
      そうでなければ false.
      ---------------------------------------- -}

      if (young_gen()->is_in_reserved(p)) {
        return true;
      }

      if (old_gen()->is_in_reserved(p)) {
        return true;
      }

      if (perm_gen()->is_in_reserved(p)) {
        return true;
      }

      return false;
    }