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* config/bfin/bfin.c (must_save_p): New function, mostly broken out of n_dregs_to_save and n_pregs_to_save. (n_pregs_to_save, n_dregs_to_save): Use it. New argument CONSECUTIVE; all callers changed. (expand_prologue_reg_save, expand_epilogue_reg_restore): Enhance to be able to save single D/P registers that aren't saved by the push/pop multiple insns. From-SVN: r130292
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