(DEBUG_INFO_UNAVAILABLE): Value stored in num_debug_info_entries
when the .debug_info section could not be loaded/parsed.
(process_debug_info): Display the length of the compilation unit
in hex, so that it corresponds with the offsets that will follow.
Tell the user if the length was 32-bit or 64-bit.
If a DIE abbreviation could not be found, tell the user the offset
of the DIE.
(free_debug_memory): Do not attempt to free any entries in the
debug_information array if num_debug_info_entries is set to
DEBUG_INFO_UNAVAILABLE.