* tree-cfg.c (gimple_duplicate_sese_tail): Remove handling of 
        the loop's number of iterations.
        * tree-parloops.c (transform_to_exit_first_loop): Add the 
        handling of the loop's number of iterations before the call 
        to gimple_duplicate_sese_tail.
        Insert the stmt caclculating the new rhs of the loop's
        condition stmt to the preheader instead of iters_bb.
        * testsuite/gcc.dg/autopar/pr49580.c: New test.

From-SVN: r175851