Fix merge conflict caused by r291921

llvm-svn: 291925
diff --git a/libcxx/include/ios b/libcxx/include/ios
index b05ee4c..49f0c01 100644
--- a/libcxx/include/ios
+++ b/libcxx/include/ios
@@ -573,7 +573,7 @@
 }
 
 #if defined(_LIBCPP_CXX03_LANG)
-struct _LIBCPP_TYPE_VIS_ONLY __cxx03_bool {
+struct _LIBCPP_TYPE_VIS __cxx03_bool {
   typedef void (__cxx03_bool::*__bool_type)();
   void __true_value() {}
 };