tree-vectorizer.c (slpeel_can_duplicate_loop_p): New name for function previously called verify_loop_for_duplication.

        * tree-vectorizer.c (slpeel_can_duplicate_loop_p): New name for function
        previously called verify_loop_for_duplication. All conditions compacted
        into one compound condition. Removed debug dumps.
        (vect_analyze_loop_with_symbolic_num_of_iters): Removed. Some of the
        functionality moved to vect_can_advance_ivs_p, and some to
        vect_analyze_loop_form.
        (vect_can_advance_ivs_p): New function. Contains functionality that was
        taken out of vect_analyze_loop_with_symbolic_num_of_iters.
        (slpeel_tree_peel_loop_to_edge): Call slpeel_can_duplicate_loop_p.
        (vect_analyze_operations): Call vect_can_advance_ivs_p and
        slpeel_can_duplicate_loop_p.
        (vect_get_loop_niters): Added documentation.
        (vect_analyze_loop_form): Check the loop entry always - not only in case
        of unknown loop bound. Create preheader and exit bb if necessary. Apply
        a check that used to take place in
        vect_analyze_loop_with_symbolic_num_of_iters.
        (vectorize_loops): Call verify_loop_closed_ssa under ENABLE_CHECKING.
        Remove redundant call to rewrite_into_loop_closed_ssa.
        (vect_compute_data_refs_alignment): Removed obsolete comment.

From-SVN: r90930