re PR c++/55877 (Anon visibility issues)

re PR c++/55877 (Anon visibility issues)

	PR c++/55877
	* decl2.c (no_linkage_error): Handle C++98 semantics.
	(reset_type_linkage): Move from decl.c.
	(reset_type_linkage_1, reset_type_linkage_2, bt_reset_linkage_1)
	(bt_reset_linkage_2, reset_decl_linkage): New.
	(tentative_decl_linkage): Factor out of expand_or_defer_fn_1.
	(cp_write_global_declarations): Move condition into no_linkage_error.
	* decl.c (grokfndecl, grokvardecl): Use no_linkage_error.
	* semantics.c (expand_or_defer_fn_1): Factor out
	tentative_decl_linkage.
	* cp-tree.h: Adjust.

From-SVN: r208157