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* fwprop.c (try_fwprop_subst): Use set_unique_reg_note to add the REG_EQ* note. * see.c (see_merge_one_use_extension): Likewise. * local-alloc.c (update_equiv_regs): Likewise. Also don't turn REG_EQUAL notes into REG_EQUIV notes if the target register may have more than one set. * function.c (assign_parm_setup_reg): Use set_unique_reg_note. * gcse.c (try_replace_reg): Likewise. * alias.c (init_alias_analysis): Use find_reg_equal_equiv_note. * calls.c (fixup_tail_calls): Likewise. Abort if there is more than one REG_EQUIV note. * reload1.c (gen_reload): Use set_unique_reg_note. From-SVN: r121821
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