* ipa-devirt.c (subbinfo_with_vtable_at_offset,
	vtable_pointer_value_to_binfo): New functions.
	* ipa-utils.h (vtable_pointer_value_to_binfo): Declare.
	* ipa-prop.c (extr_type_from_vtbl_ptr_store): Use it.
	* g++.dg/ipa/devirt-23.C: New testcase.
	* g++.dg/ipa/devirt-20.C: Fix template.

From-SVN: r207413