[autovect] [patch] more cleanups

[Dorit Nuzman]

Fix typos, factor code.
Bootstrapped with vectorization enabled and tested on the vectorizer
testcases on powerpc-linux. Committed to autovect-branch.

dorit

(See attached file: autovect.feb8)

        * tree-vect-transform.c (vect_align_data_ref): Removed.
        (vect_transform_strided_store, vectorizable_store): Remove call to
        vect_align_data_ref.

        (vect_setup_realignment): Fix comment.

        (vect_get_vec_def_for_stmt_copy): New function.
        (vectorizable_reduction, vectorizable_operation,
vectorizable_store):
        (vectorizable_type_demotion, vectorizable_type_promotion): Replace
code
        that was factored out into vect_get_vec_def_for_stmt_copy with a
call.
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