PR ipa/58252
	PR ipa/59226
	* ipa-devirt.c record_target_from_binfo): Take as argument
	stack of binfos and lookup matching one for virtual inheritance.
	(possible_polymorphic_call_targets_1): Update.

	* g++.dg/ipa/devirt-20.C: New testcase.	
	* g++.dg/torture/pr58252.C: Likewise.
	* g++.dg/torture/pr59226.C: Likewise.

From-SVN: r206516