PR32067, ld -Wl,--oformat,binary crash in _bfd_elf_link_keep_memory

The direct fix for this segfault is to test for a non-NULL bed in
_bfd_elf_link_keep_memory, but also there isn't much point in running
code for LTO if the output is binary.

	PR 32067
	* elflink.c (_bfd_elf_link_keep_memory): Test for non-NULL bed.
	(elf_link_add_object_symbols): Don't run the loop setting
	non_ir_ref_regular if the output hash table is not ELF.