Missing benchmark CCVector.push

[illusory0x0]

we need to add more benchmark...,

source loc

    B.throughputN time ~repeat
      [
        "Map.add", bench_map, ()
        (*       ; "RAL.append", bench_ral ral, () *)
        (* too slow *);
        "Sek.Persistent.push", bench_sek, ();
        "funvec.push", bench_funvec, ();
        "pvec.push", bench_pvec, ();
        "batvec.append", bench_batvec, ();
      ]