* alpha-tdep.c (alpha_register_name): Add comment.

    * alpha-tdep.c (alpha_register_name): Add comment.
        (alpha_cannot_fetch_register): Exclude registers numbers which
        are no longer used from the list of registers that can be fetched.
        (alpha_cannot_store_register): Exclude registers numbers which
        are no longer used from the list of registers that can be stored.
        * alpha-nat.c (fetch_osf_core_registers): Add missing value in
        core_reg_mapping array.