* dwarf.c (process_debug_info): Include the CU offset and corrupt

    * dwarf.c (process_debug_info): Include the CU offset and corrupt
        version value when reporting unrecognised DWARF version numbers.
        (load_debug_info): Remember a failed attempt to load and parse the
        .debug_info section and do not repeat such attempts.
        (display_debug_lines): Check the return value from load_debug_info
        and return whilst displaying a warning message if the load failed.
        (display_debug_loc): Likewise.
        (display_debug_ranges): Likewise.