private static long rawIndex(long[] ary, int i) {
      assert i >= 0 && i < ary.length;
      return _Lbase + (i * (long)_Lscale);
    }
Return the internal counter striping factor.  Useful for diagnosing
performance problems.
jctools-core/src/main/java/org/jctools/maps/ConcurrentAutoTable.java