The problem is that passing anything other than a integer to a limit
clause in a prepared statement would fail. This limitation was introduced
to avoid replication problems (e.g: replicating the statement with a
string argument would cause a parse failure in the slave).

The solution is to convert arguments to the limit clause to a integer
value and use this converted value when persisting the query to the log.


mysql-test/r/limit.result:
  Update test case result.
mysql-test/r/ps.result:
  Add test case result for Bug#33851
mysql-test/r/rpl_user_variables.result:
  Test case result for replication of prepared statement with
  limit clause.
mysql-test/t/limit.test:
  Test parameters to limit clause.
mysql-test/t/ps.test:
  Add test case for Bug#33851
mysql-test/t/rpl_user_variables.test:
  Test replication of a parameter which value is converted.
sql/item.cc:
  Convert value to integer if it's a parameter to a limit clause.
sql/item.h:
  Flag signal that item is a parameter to a limit clause.
sql/item_func.cc:
  Const member functions, object is not mutated.
sql/sql_class.h:
  Const member functions, object is not mutated.
sql/sql_yacc.yy:
  Flag that item is a parameter to a limit clause.