Support normal type_info-based EH mechanisms with -fno-rtti.

Support normal type_info-based EH mechanisms with -fno-rtti.

	* except.c (build_eh_type_type): Remove special -fno-rtti handling.
	(build_eh_type_type_ref): Likewise.
	(build_eh_type): Remove.
	(expand_throw): Call build_eh_type_type, not build_eh_type.
	* decl2.c (import_export_decl): Don't associate the tinfo fn with
	the vtable if -fno-rtti.
	* decl.c (init_decl_processing): Always init_rtti_processing.

	* rtti.c (get_typeid): Don't complain about -fno-rtti.

From-SVN: r29715