* elflink.c (elf_link_add_object_symbols): Don't save symbol
	hashes around loading as-needed library.  Zero them on allocation,
	and restore to initial all-zero state if library not needed.
	Arrange to reuse hashes if we load library again later.
	* elf64-ppc.c (opd_entry_value): Handle case where symbol
	hashes are not available.