[lno] [patch] couple fixes

[Dorit Naishlos]

1) A fix following http://gcc.gnu.org/ml/gcc-patches/2004-07/msg02088.html
(struct loops may have null entries now);
2) Give an ssa-name to a variable that used to be marked for renaming (but
is not marked for renaming since this patch -
http://gcc.gnu.org/ml/gcc-patches/2004-07/msg01168.html).

dorit

      * tree-vectorizer.c (vect_create_index_for_array_ref): Remove
        unused variable step_val.
        (vect_init_vector): Create ssa_name for def of init_stmt.
        (vectorize_loops): Check if loop is null.
(See attached file: out.Aug4)
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