re PR ipa/60871 (internal compiler error: in possible_polymorphic_call_targets, at ipa-devirt.c:1510)


	PR ipa/60871
	PR ipa/64139
	* tree.c (lookup_binfo_at_offset): New function.
	(get_binfo_at_offset): Use it.

	* g++.dg/torture/pr64139.C: New testcase.
	* g++.dg/torture/pr60871.C: Likewise.

From-SVN: r220185