[Maria-developers] Step#5: MDEV-7950, , Item_func::type() takes 0.26% in OLTP RO

Hi Sergey, please review the next step for MDEV-7950. This step changes the function remove_eq_conds() into a method in Item. It removes 6 virtual calls for Item_func::type(), and adds only 2 virtual calls for Item***::remove_eq_conds(). Thanks.