* cp-tree.h (CAN_HAVE_FULL_LANG_DECL_P): New macro.
* class.c (build_vtable): Use build_lang_field_decl to build the
VAR_DECLs for vtables.
(prepare_fresh_vtable): Likewise.
* decl.c (duplicate_decls): Only copy DECL_SAVED_TREE if
CAN_HAVE_FULL_LANG_DECL_P.
(push_using_decl): Use build_lang_decl to build USING_DECLs.
(grokdeclarator): Use build_lang_decl to build TYPE_DECLs.
* lex.c (retrofit_lang_decl): Check CAN_HAVE_FULL_LANG_DECL_P.
(build_lang_field_decl): Likewise.
(copy_lang_decl): Use CAN_HAVE_FULLLANG_DECL_P to decide how much
to copy.
From-SVN: r28731
