re PR lto/59468 (ICE on invalid C++ code with LTO in gimple_get_virt_method_for_binfo...

re PR lto/59468 (ICE on invalid C++ code with LTO in gimple_get_virt_method_for_binfo, at gimple-fold.c:3224)

	PR lto/59468
	* ipa-utils.h (possible_polymorphic_call_targets): Update prototype
	and wrapper.
	* ipa-devirt.c: Include demangle.h
	(odr_violation_reported): New static variable.
	(add_type_duplicate): Update odr_violations.
	(maybe_record_node): Add completep parameter; update it.
	(record_target_from_binfo): Add COMPLETEP parameter;
	update it as needed.
	(possible_polymorphic_call_targets_1): Likewise.
	(struct polymorphic_call_target_d): Add nonconstruction_targets;
	rename FINAL to COMPLETE.
	(record_targets_from_bases): Sanity check we found the binfo;
	fix COMPLETEP updating.
	(possible_polymorphic_call_targets): Add NONCONSTRUTION_TARGETSP
	parameter, fix computing of COMPLETEP.
	(dump_possible_polymorphic_call_targets): Imrove readability of dump; at
	LTO time do demangling.
	(ipa_devirt): Use nonconstruction_targets; Improve dumps.
	* gimple-fold.c (gimple_get_virt_method_for_vtable): Add can_refer
	parameter.
	(gimple_get_virt_method_for_binfo): Likewise.
	* gimple-fold.h (gimple_get_virt_method_for_binfo,
	gimple_get_virt_method_for_vtable): Update prototypes.

	PR lto/59468
	* g++.dg/ipa/devirt-27.C: New testcase.
	* g++.dg/ipa/devirt-26.C: New testcase.

From-SVN: r207702