Fix memory access violations discovered by running readelf compiled with undefined...

Fix memory access violations discovered by running readelf compiled with undefined memory access sanitization on fuzzed binaries.

	PR binutils/17531
	* dwarf.c (display_debug_pubnames_worker): Use dwarf_vma type for
	offset.
	* readelf.c (dump_relocations): Handle printing offsets which are
	MIN_INT.
	(process_corefile_note_segment): Add range check of the namesz
	field.