MDEV-15703: Crash in EXECUTE IMMEDIATE 'CREATE OR REPLACE TABLE t1 (a INT DEFAULT ?)' USING DEFAULT

This patch fixes the issue with passing the DEFAULT or IGNORE values to
positional parameters for some kind of SQL statements to be executed
as prepared statements.

The main idea of the patch is to associate an actual value being passed
by the USING clause with the positional parameter represented by
the Item_param class. Such association must be performed on execution of
UPDATE statement in PS/SP mode. Other corner cases that results in
server crash is on handling CREATE TABLE when positional parameter
placed after the DEFAULT clause or CALL statement and passing either
the value DEFAULT or IGNORE as an actual value for the positional parameter.
This case is fixed by checking whether an error is set in diagnostics
area at the function pack_vcols() on return from the function pack_expression()

mysql-test/main/table_value_constr.test

@@ -1349,9 +1349,9 @@ DELIMITER ;$$
 VALUES (IGNORE);
 --error ER_UNKNOWN_ERROR
 VALUES (DEFAULT);
---error ER_UNKNOWN_ERROR
+--error ER_INVALID_DEFAULT_PARAM
 EXECUTE IMMEDIATE 'VALUES (?)' USING IGNORE;
---error ER_UNKNOWN_ERROR
+--error ER_INVALID_DEFAULT_PARAM
 EXECUTE IMMEDIATE 'VALUES (?)' USING DEFAULT;
 
 --echo #