* ipa-cp.c (ipa_get_indirect_edge_target_1): Do direct
	lookup via vtable pointer; check for type consistency
	and turn inconsitent facts into UNREACHABLE.
	* ipa-prop.c (try_make_edge_direct_virtual_call): Likewise.
	* gimple-fold.c (gimple_get_virt_method_for_vtable): 
	Do not ICE on type inconsistent querries; return UNREACHABLE
	instead.

	* testsuite/g++.dg/ipa/devirt-25.C: New testcase.

From-SVN: r207448