PR binutils/6483

    PR binutils/6483
        * objdump.c (dump_bfd): If the -g option found no STABS or IEEE
        debug information to display, try dumping DWARF information
        instead.
        * rddbg.c (read_debugging_info): Add a parameter to suppress the
        display of a warning message when no debug information is found.
        * budbg.h (read_debugging_info): Update prototype.
        * objcopy.c (copy_object): Continue to allow read_debugging_info
        to produce warning messages.
        * doc/binutils.texi (--debugging): Document new behaviour of the
        -g/--debugging option.