[lno] [patch] fixes

[Dorit Naishlos <DORIT at il dot ibm dot com>]

Fixes for a few bugs exposed by the recent changes to the lno optimizations
driver (http://gcc.gnu.org/ml/gcc-patches/2004-06/msg00701.html), including
a temporary
call to rewrite_into_loop_closed_ssa after vectorization (will be removed
as soon as we add the required bits to maintain the loop closed SSA during
vectorization).

dorit

        * tree-chrec.c (evolution_function_is_affine_multivariat): Add
check
        for POLYNOMIAL_CHREC.
        * tree-dg.c (ddg_direction_between_stmts): Add check for chrec_top.

        * tree-pass.h (TODO_write_loop_closed): New to-do flag.
        * tree-optimize.c (execute_todo): Handle new to-do flag
        TODO_write_loop_closed.
        * tree-ssa-loop.c (struct tree_opt_pass pass_vectorize): Set
        TODO_write_loop_closed.

        * tree-vectorizer.c (vect_transform_loop): Add calls to
        add_bb_to_loop.
        (vect_analyze_data_ref_dependence): Fix last argment in call to
        ddg_direction_between_stmts.

(See attached file: fixes.lno)

Attachment: fixes.lno
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