* cse.c (count_reg_usage): Correctly handle REG_NONNEG notes.
        (delete_trivially_dead_insns): Renamed from delete_dead_from_cse.
        * toplev.c (rest_of_compilation): Call delete_trivially_dead_insns
        instead of delete_dead_from_cse.  Also call delete_trivially_dead_insns
        between loop optimization passes.
        * rtl.h: Updated appropriately.

From-SVN: r19100