Both arguments of the function NAME_CONST must be constant expressions.
This constraint is checked in the Item_name_const::fix_fields method. 
Yet if the argument of the function was not a constant expression no
error message was reported. As a result the client hanged waiting for a
response.
Now the function Item_name_const::fix_fields reports an error message
when any of the additional context conditions imposed on the function
NAME_CONST is not satisfied. 


mysql-test/r/func_misc.result:
  Added a test case for bug #26545.
mysql-test/t/func_misc.test:
  Added a test case for bug #26545.