* tree-vectorizer.h (unknown_alignment_for_access_p): Replaced by
        known_alignment_for_access_p.
        (known_alignment_for_access_p): New.
        (do_peeling_for_alignment): Field made int instead of bool and renamed
        to peeling_for_alignment.
        (LOOP_DO_PEELING_FOR_ALIGNMENT): Renamed to LOOP_PEELING_FOR_ALIGNMENT.
        * tree-vect-analyze.c (vect_determine_vectorization_factor): New. This
        functionality used to be in vect_analyze_operations.
        (vect_analyze_operations): Code to determine vectorization factor was
        moved to vect_determine_vectorization_factor.
        (vect_enhance_data_refs_alignment): Update to correct alignment when it
        is known instead of -1.  Set LOOP_PEELING_FOR_ALIGNMENT to peeling
        factor.
        (vect_analyze_loop): Call vect_determine_vectorization_factor (used to
        be part of vect_analyze_operations).
        * tree-vectorizer.c (slpeel_tree_peel_loop_to_edge): Use fold when
        creating the guard condition, as the number of iterations may be
        constant.
        (slpeel_tree_peel_loop_to_edge): Use new name of
        LOOP_DO_PEELING_FOR_ALIGNMENT. Set it to 0 instead of false.
        * tree-vect-transform.c (vect_gen_niters_for_prolog_loop): Handle known
        alignment case more efficiently. Use LOOP_PEELING_FOR_ALIGNMENT.
        (vect_do_peeling_for_alignment): Use fold.
        (vect_transform_loop): Use new name of LOOP_DO_PEELING_FOR_ALIGNMENT.

        (vect_update_inits_of_dr): Renamed to
        vect_update_init_of_dr.
        (vect_update_inits_of_drs): Use new name of vect_update_inits_of_dr.
        (vectorizable_store): Fix assertion to use == instead of =.

From-SVN: r96526