The code for executing indexed ORDER BY was not setting all the 
internal fields correctly when selecting to execute ORDER BY over
and index.
Fixed by change the access method to one that will use the 
quick indexed access if one is selected while selecting indexed
ORDER BY.


mysql-test/r/order_by.result:
  Bug #35206: test case
mysql-test/t/order_by.test:
  Bug #35206: test case
sql/sql_select.cc:
  Bug #35206: Change the access method when selecting a 
  quick indexed access.