Broken smart groups due to CRM-16858

There was a regression on searches in 4.6.5 which was resolved in CRM-16858 (which is marked minor but really should be major, which warrants a quick release of 4.6.6. I've seen several stack exchange posts and customer issues).

Unfortunately the fix for CRM-16858 doesn't work for smart groups created using event search prior to CRM-16858 being added as the data stored in civicrm_saved_search needs to be updated

Pre-CRM-16858 the array form_values would hole the key
'participant_status_id' => array(2 => 1, 5 => 1)

Post CRM-16858 it needs to be
'participant_status_id' => array('IN' => array(2 , 5))

Note that the contents of the WHERE field are unaffected & I do somewhat wonder the way the values are stored as form_values is a bit fragile