* flow.c (make_edge): Early out, if no flags to set.

        (calculate_global_regs_live): Clear out garbage only when necessary.

        * simplify-rtx.c (varray_type used_regs): New.
        (clear_table): Use it to only clear necessary items.
        (cselib_lookup, cselib_record_set): Remember newly set items.
        (cselib_update_varray_sizes, cselib_init): Initialize and grow
        used_regs.

        * local-alloc.c (update_equiv_regs): New local `cleared_regs'.
        Move clearing of dead regs out of insn-loop.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@37899 138bc75d-0d04-0410-961f-82ee72b054a4

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