MEMORY LEAK.

Background:
 - There are caches for stored functions and stored procedures (SP-cache);
 - There is no similar cache for events;
 - Triggers are cached together with TABLE objects;
 - Those SP-caches are per-session (i.e. specific to each session);
 - A stored routine is represented by a sp_head-instance internally;
 - SP-cache basically contains sp_head-objects of stored routines, which
   have been executed in a session;
 - sp_head-object is added into the SP-cache before the corresponding
   stored routine is executed;
 - SP-cache is flushed in the end of the session.

The problem was that SP-cache might grow without any limit. Although this
was not a pure memory leak (the SP-cache is flushed when session is closed),
this is still a problem, because the user might take much memory by
executing many stored routines.

The patch fixes this problem in the least-intrusive way. A soft limit
(similar to the size of table definition cache) is introduced. To represent
such limit the new runtime configuration parameter 'stored_program_cache'
is introduced. The value of this parameter is stored in the new global
variable stored_program_cache_size that used to control the size of SP-cache
to overflow. 

The parameter 'stored_program_cache' limits number of cached routines for
each thread. It has the following min/default/max values given from support:
  min = 256, default = 256, max = 512 * 1024.
Also it should be noted that this parameter limits the size of 
each cache (for stored procedures and for stored functions) separately.

The SP-cache size is checked after top-level statement is parsed.
If SP-cache size exceeds the limit specified by parameter
'stored_program_cache' then SP-cache is flushed and memory allocated for
cache objects is freed. Such approach allows to flush cache safely 
when there are dependencies among stored routines.


sql/mysqld.cc:
  Added global variable stored_program_cache_size to store value of
  configuration parameter 'stored-program-cache'.
sql/mysqld.h:
  Added declaration of global variable stored_program_cache_size.
sql/sp_cache.cc:
  Extended interface for sp_cache by adding helper routine
  sp_cache_enforce_limit to control size of stored routines cache for
  overflow. Also added method enforce_limit into class sp_cache that
  implements control of cache size for overflow.
sql/sp_cache.h:
  Extended interface for sp_cache by adding standalone routine
  sp_cache_enforce_limit to control size of stored routines cache
  for overflow.
sql/sql_parse.cc:
  Added flush of sp_cache after processing of next sql-statement
  received from a client.
sql/sql_prepare.cc:
  Added flush of sp_cache after preparation/execution of next prepared
  sql-statement received from a client.
sql/sys_vars.cc:
  Added support for configuration parameter stored-program-cache.