* ipa-cp.c (ipa_get_indirect_edge_target_1): Add sanity check
	for ipa-devirt.
	* ipa-utils.h (possible_polymorphic_call_target_p): New function.
	* ipa-devirt.c (possible_polymorphic_call_target_p): Be tolerant
	of external calls
	* gimple-fold.c: Include ipa-utils.h and gimple-pretty-print.h
	(gimple_fold_call): Dump inconsistent devirtualizations; add
	sanity check for type based devirtualizations.
	* ipa-prop.c: Include ipa-utils.h
	(ipa_intraprocedural_devirtualization): Add sanity check.
	(try_make_edge_direct_virtual_call): Likewise.

From-SVN: r202837