objc-act.c (get_proto_encoding, [...]): New fucnctions.

        * objc-act.c (get_proto_encoding, build_typed_selector_reference):
        New fucnctions. (UTAG_PROTOCOL): New define.
        (objc_selector_template, flag_typed_selectors): New variables.
        (objc_init): set flag_typed_selectors if -fgnu-runtime.
        (synth_module_prologue): Change declaration of
        _OBJC_SELECTOR_TABLE when flag_typed_selectors is non-null.
        (build_module_descriptor): Make sure the generated constructor
        function is declared public.
        (build_selector): Only cast to SEL when not doing typed selectors.
        (build_selector_translation_table): Rewrite initialization.
        (build_tmp_function_decl): Make up new name when called, since it
        may now be called multiple times.
        (hack_method_prototype): Use init_function_start to reinit args
        machinery.  Also set current_function_decl before calling
        assign_parms.
        (generate_protocols):  Don't generate encoding twice.
        (build_selector_template): New function.
        (build_method_list_template): Generate (void*)0 as first element,
        not (int)0.
        (build_message_expr): move the call to build_selector_reference
        towards the end, where we have determined the function prototype.

From-SVN: r7620