re PR c++/19733 (ICE on invalid destructor call)

re PR c++/19733 (ICE on invalid destructor call)

	PR c++/19733
	* class.c (add_method): Don't set TYPE_HAS_DESTRUCTOR.
	(check_bases): Give warnings about a base class with a
	non-virtual destructor, even if it is implicit.
	(finish_struct_bits): Don't copy TYPE_HAS_DESTRUCTOR.
	(maybe_warn_about_overly_private_class): Don't use
	TYPE_HAS_DESTRUCTOR.
	(finish_struct_methods): Don't set TYPE_HAS_DESTRUCTOR.
	(check_for_override): Give it external linkage.
	(add_implicitly_declared_members): Generate destructors lazily.
	(check_field_decls): Use TYPE_HAS_NONTRIVIAL_DESTRUCTOR, not
	TYPE_HAS_DESTRUCTOR.
	(check_bases_and_members): Call check_methods before
	check_field_decls.
	(check_bases_and_members): Use TYPE_HAS_NONTRIVIAL_DESTRUCTOR, not
	TYPE_HAS_DESTRUCTOR.
	(finish_struct_1): Do not use TYPE_HAS_DESTRUCTOR.
	* cp-tree.def (PSEUDO_DTOR_EXPR): Document.
	* cp-tree.h (TYPE_HAS_DESTRUCTOR): Remove.
	(lang_type_class): Add lazy_destructor.
	(CLASSTYPE_LAZY_DESTRUCTOR): New macro.
	(CLASSTYPE_DESTRUCTORS): Robustify.
	(TYPE_HAS_DESTRUCTOR): Remove.
	(check_for_override): Declare.
	(build_vbase_delete): Remove.
	* cvt.c (convert_to_void): Issue errors about pseudo-destructor
	expressions.
	* decl.c (cxx_maybe_build_cleanup): Remove dead code.
	* except.c (dtor_nothrow): Lazily create destructors if necessary.
	(build_throw): Use TYPE_HAS_NONTRIVIAL_DESTRUCTOR.
	* init.c (build_delete): Lazily create destructors, if necessary.
	(build_vbase_delete): Remove.
	* method.c (locate_dtor): Simplify.
	(implicitly_declare_fn): Add support for destructors.
	* parser.c (cp_parser_lookup_name): Lazily create destructors, if
	necessary.
	* pt.c (check_explicit_specialization): Don't use
	TYPE_HAS_DESTRUCTOR.
	(instantiate_class_template): Likewise.
	* ptree.c (cxx_print_type): Don't print TYPE_HAS_DESTRUCTOR.
	* rtti.c (emit_support_tinfos): Robustify.
	* search.c (lookup_fnfields_1): Lazily create destructors.
	* typeck.c (build_class_member_access_expr): Remove
	PSEUDO_DTOR_EXPR handling.
	(lookup_destructor): Likewise.

	PR c++/19733
	* g++.dg/parse/crash23.C: New test.
	* g++.dg/warn/Weff1.C: New test.

From-SVN: r94759