After the patch for big 21698 equality propagation stopped
working for BETWEEN and IN predicates with STRING arguments.
This changeset completes the solution of the above patch.


mysql-test/r/select.result:
  Added a test case for bug #22735.
mysql-test/t/select.test:
  Added a test case for bug #22735.
sql/item_cmpfunc.h:
  Fixed bug #22753.
  After the patch for big 21698 equality propagation stopped
  working for BETWEEN and IN predicates with STRING arguments.
  This changeset completes the solution of the above patch.
  
  Added an implementation of the subst_argument_checker method
  for Item_func_opt_neg (the direct ancestor of Item_func_between
  and Item_func_in) which allows equality propagation for
  BETWEEN and IN predicates.