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https://launchpad.net/bugs/586348
fix pthread atomics. operator precedence is important. The unit test now passes.

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plugin/myisam/mi_range.cc
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
 
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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
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/*
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  Gives a approximated number of how many records there is between two keys.
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  if (fast_mi_readinfo(info))
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    return(HA_POS_ERROR);
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  info->update&= (HA_STATE_CHANGED+HA_STATE_ROW_CHANGED);
 
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  if (info->s->concurrent_insert)
 
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    pthread_rwlock_rdlock(&info->s->key_root_lock[inx]);
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  switch(info->s->keyinfo[inx].key_alg){
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  case HA_KEY_ALG_BTREE:
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      res=HA_POS_ERROR;
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  }
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  if (info->s->concurrent_insert)
 
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    pthread_rwlock_unlock(&info->s->key_root_lock[inx]);
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  fast_mi_writeinfo(info);
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  return(res);