* ipa-utils.h (update_type_inheritance_graph): Declare.
	(possible_polymorphic_call_target_p): Declare.
	(possible_polymorphic_call_target_p): New.
	* ipa-devirt.c: Update toplevel comments.
	(cached_polymorphic_call_targets): Move up.
	(odr_type_d): Move ID down.
	(polymorphic_type_binfo_p): Update comment.
	(odr_hasher::remove): Likewise;
	(get_odr_type): Set anonymous_namespace.
	(dump_odr_type): Dump it.
	(dump_type_inheritance_graph): Do not ICE when there are no ODR types.
	(maybe_record_node): Record node in cached_polymorphic_call_targets.
	(record_binfo): Add comment.
	(free_polymorphic_call_targets_hash): Do not ICE when cache is not built.
	(devirt_node_removal_hook): Do not iCE when cache is freed.
	(possible_polymorphic_call_target_p): New predicate.
	(update_type_inheritance_graph): New function.

From-SVN: r201917