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* config/bfin/bfin.c (struct machine_function): New member has_loopreg_clobber. (bfin_expand_movmem): Set it when generating memcpy insns. (n_regs_saved_by_prologue, expand_prologue_reg_save, expand_epilogue_reg_restore): If we have hardware loops, memcpy insns (indicated by has_loopreg_clobber) or function calls, we need to save the loop registers. From-SVN: r141425
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