* class.c (build_vtable): Use build_lang_decl when building
	vtables, not just build_decl.
	(prepare_fresh_vtable): Likewise.
	* decl.c (wrapup_globals_for_namespace): Mark vtables as
	DECL_EXTERNAL when calling wrapup_global_declarations.
	* decl2.c (priority_info_s): Add initializations_p and
	destructions_p members.
	(finish_vtable_vardecl): Use TREE_SYMBOL_REFERENCED, not TREE_USED,
	when deciding what vtables to write out.
	(ssdf_decls): New variable.
	(ssdf_decls_used): Likewise.
	(start_static_storage_duration_function): Deal with being called
	multiple times.  Avoid inlining this function.
	(generate_inits_for_priority): Deal with reuse of priority map.
	(get_priority_info): Clear initializations_p and destructions_p.
	(do_static_initialization): Tweak comment.
	(do_static_destruction): Likewise.  Fix condition on sentries for
	destruction.
	(generate_ctor_or_dtor_function): Call all of the static storage
	duration functions.
	(generate_ctor_or_dtor_function_for_priority): Check
	initializations_p and destructions_p to see what priorities need
	initialization functions.
	(finish_file): Rework to generate multiple static storage duration
	functions, rather than just one.

From-SVN: r26713