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Changes in an item tree done by optimizer weren't properly registered and went unnoticed, which resulted in preliminary freeing of used memory. mysql-test/r/ps.result: Add result for bug#21166: Prepared statement causes signal 11 on second execution. mysql-test/t/ps.test: Add test case for bug#21166: Prepared statement causes signal 11 on second execution. sql/item.cc: Move Item::transform() and Item_default_value::transform() from item.h here and use THD::change_item_tree() instead of plain assignment. Change Item_field::set_no_const_sub() to be used with Item::walk() instead of Item::transform(). sql/item.h: Move definition of Item::transform() and Item_default_value::transform() to item.cc. Change Item::set_no_const_sub() to be used with Item::walk() instead of Item::transform(). sql/item_cmpfunc.cc: Use Item::walk() to execute Item::set_no_const_sub(). Use THD::change_item_tree() instead of plain assignment. sql/item_func.cc: Add assert and comment to Item_func::traverse_cond(). sql/item_row.cc: Use THD::change_item_tree() instead of plain assignment. sql/item_strfunc.cc: Move Item_func_make_set::transform() from item_strfunc.h here and use THD::change_item_tree() instead of plain assignment. sql/item_strfunc.h: Move definition of Item_func_make_set::transform() to item_strfunc.cc.
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