* flow.c (add_to_mem_set_list): New function.
        (init_propagate_block_info): Use it.
        (mark_set_1): Likewise.
        (insn_dead_p): Canonicalize memory address for dead store
        comparison.  Allow wider mode stores to kill narrower mode stores.
        (invalidate_mems_from_autoinc): Use invalidate_mems_from_set.
        (invalidate_mems_from_set): Don't handle MEMs.

From-SVN: r44441