Abandon invalidation of stored routines based on a global integer counter which is increased on any DDL (Cversion). Similarly to prepared statements (WL#4165), attach a list of versions of used objects to each stored routine and validate each routine before execution, i.e. check that versions didn't change from the last load. In case of a validation failure, re-load from disk and re-parse if there was an interim DDL. Rationale: * the same approach applied to all composite objects * is expected to give a performance improvement, since currently any DDL in any threads flushes all stored procedure caches in all connections. * this can be a simple solution to Bug#<to be added>, but will not fix other bugs, such as BUG#33082 May be made obsolete by WL#4179: Stored Programs: validation of individual statements.