* tree.c (need_assembler_name_p): Artificial types have no ODR
	names.
	* ipa-devirt.c (warn_odr): Do not try to apply ODR cache when
	no caching is done.
	* lto.c (lto_read_decls): Move code registering odr types out
	of TYPE_CANONICAL conditional and also register polymorphic types.

From-SVN: r221797