[modules] Don't diagnose a conflict between two using-declarations that name equivalent internal linkage entities.

llvm-svn: 257512
diff --git a/clang/test/Modules/using-decl-redecl.cpp b/clang/test/Modules/using-decl-redecl.cpp
index 0e78cec..0524052 100644
--- a/clang/test/Modules/using-decl-redecl.cpp
+++ b/clang/test/Modules/using-decl-redecl.cpp
@@ -2,10 +2,20 @@
 // RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t \
 // RUN:            -fmodule-map-file=%S/Inputs/using-decl-redecl/module.modulemap \
 // RUN:            -I%S/Inputs/using-decl-redecl \
+// RUN:            -Wno-modules-ambiguous-internal-linkage \
 // RUN:            -verify %s
+
+#include "d.h"
+
+const int n = 0;
+namespace M { using ::n; }
+
 #include "c.h"
+
 N::clstring y = b;
 
 // Use a typo to trigger import of all declarations in N.
 N::clstrinh s; // expected-error {{did you mean 'clstring'}}
-// expected-note@a.h:2 {{here}}
+// expected-note@a.h:3 {{here}}
+
+namespace M { using N::n; }