asan: evax_bfd_print_image buffer overflow

	* vms-alpha.c (evax_bfd_print_image): Sanity check printing of
	"image activator fixup" section.
	(evax_bfd_print_relocation_records): Sanity check buffer offsets.
	(evax_bfd_print_address_fixups): Likewise.
	(evax_bfd_print_reference_fixups): Likewise.