* Makeifle-in (ipa-devirt.o): New.
	(GTFILES): Add ipa-utils.h and ipa-devirt.c
	* cgraphunit.c (decide_is_symbol_needed): Do not care about virtuals.
	(analyze_functions): Look into possible targets of polymorphic call.
	* dumpfile.c (dump_files): Add type-inheritance dump.
	* dumpfile.h (TDI_inheritance): New.
	* ipa-devirt.c: New file.
	* ipa-utils.h (odr_type_d): Forward declare.
	(odr_type): New type.
	(build_type_inheritance_graph): Declare.
	(possible_polymorphic_call_targets): Declare and introduce inline
	variant when only edge is pased.
	(dump_possible_polymorphic_call_targets): Likewise.
	* timevar.def (TV_IPA_INHERITANCE, TV_IPA_VIRTUAL_CALL): New.
	* tree.c (type_in_anonymous_namespace_p): Break out from ...
	(types_same_for_odr): ... here.
	* tree.h (type_in_anonymous_namespace_p): Declare.

	* g++.dg/ipa/type-inheritance-1.C: New testcase.

From-SVN: r201836