Using view columns by their names during an execution of
a prepared SELECT statement or a SELECT statement inside
a SP caused a memory leak.


sql/sql_base.cc:
  Fixed bug #29834.
  The find_field_in_view function has been modified to
  use the execution memory root for the Item_direct_view_ref
  objects allocation at non-first executions of
  a PS/SP instead of the statement memory.
mysql-test/t/sp.test:
  Updated test case for bug #29834.
mysql-test/r/sp.result:
  Updated test case for bug #29834.