when using ORDER BY

Insert were inserting data from last record fetched instead of inserting from 
temporary table.

Make Item_ref to save data from result_field if it's available rather then
from *ref on save_in_field() call.



sql/item.h:
   Fix bug#11298 insert into select from VIEW produces incorrect result when using ORDER BY
sql/item.cc:
  Fix bug#11298 insert into select from VIEW produces incorrect result when using ORDER BY
mysql-test/r/view.result:
  Test case for bug#11298 insert into select from VIEW produces incorrect result when using ORDER BY
mysql-test/t/view.test:
  Test case for bug#11298 insert into select from VIEW produces incorrect result when using ORDER BY