* flow.c (mark_set_1): Use loop_depth+1 as reference weight.

    * flow.c (mark_set_1): Use loop_depth+1 as reference weight.
        (find_auto_inc, mark_used_regs, try_pre_increment_1): Likewise.
        (count_reg_sets_1, count_reg_references): Likewise.
        (flow_loops_level_compute): Start counting actual loop depth at 1.
        (flow_loops_find): Likewise.
        * local-alloc.c (update_equiv_regs): Likewise.
        * regclass.c (regclass): Re-instate Jan 4 0-based loop_depth change.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@31259 138bc75d-0d04-0410-961f-82ee72b054a4