Comment 13 for bug 655463

I think the problem is the Boyer-Moore shift in two_way_long_needle in
str-two-way.h. It does not correctly update MEMORY. I think we need something
like

          if (memory && shift < period)
        {
          /* Since needle is periodic, but the last period has
             a byte out of place, there can be no match until
             after the mismatch. */
          shift = needle_len - period;
          memory = 0;
        }
          else if (memory > shift)
        memory = memory - shift;
          else
        memory = 0;