Increment the I_P_List counter whenever a element is inserted into the list. Previously, the counter would only be incremented if the insertion method push_front() was used, in which case the counter wouldn't be incremented if a element was inserted using the push_back() and/or insert_after() methods.
Increment the I_P_List counter whenever a element is inserted into
the list. Previously, the counter would only be incremented if the
insertion method push_front() was used, in which case the counter
wouldn't be incremented if a element was inserted using the push_back()
and/or insert_after() methods.

Currently this does not affect the code base because there isn't any
code that uses a counted list with the push_back() or insert_after()
methods.

flynn1973/mariadb-aix,davidl-zend/zenddbi,flynn1973/mariadb-aix,davidl-zend/zenddbi,natsys/mariadb_10.2,flynn1973/mariadb-aix,ollie314/server,natsys/mariadb_10.2,ollie314/server,davidl-zend/zenddbi,flynn1973/mariadb-aix,davidl-zend/zenddbi,natsys/mariadb_10.2,natsys/mariadb_10.2,slanterns/server,ollie314/server,natsys/mariadb_10.2,flynn1973/mariadb-aix,davidl-zend/zenddbi,natsys/mariadb_10.2,ollie314/server,flynn1973/mariadb-aix,flynn1973/mariadb-aix,davidl-zend/zenddbi,natsys/mariadb_10.2,davidl-zend/zenddbi,davidl-zend/zenddbi,flynn1973/mariadb-aix,ollie314/server,natsys/mariadb_10.2,davidl-zend/zenddbi,ollie314/server,natsys/mariadb_10.2,flynn1973/mariadb-aix,davidl-zend/zenddbi,ollie314/server,flynn1973/mariadb-aix,ollie314/server,natsys/mariadb_10.2,davidl-zend/zenddbi,ollie314/server,ollie314/server,flynn1973/mariadb-aix,natsys/mariadb_10.2,ollie314/server