Friends cannot be declared module-private

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@139411 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Modules/module-private.cpp b/test/Modules/module-private.cpp
index 0f1d592..849897f 100644
--- a/test/Modules/module-private.cpp
+++ b/test/Modules/module-private.cpp
@@ -95,6 +95,9 @@
 struct public_class {
   struct inner_struct;
   static int static_var;
+
+  friend __module_private__ void public_func(); // expected-error{{friend cannot be declared __module_private__}}
+  friend __module_private__ struct public_struct; // expected-error{{friend cannot be declared __module_private__}}
 };
 
 template<> __module_private__ struct public_class<int>::inner_struct { }; // expected-error{{member specialization cannot be declared __module_private__}}