When performing unqualified name lookup in C++, don't look directly
into transparent contexts; instead, we'll look into their nearest
enclosing non-transparent contexts further up the stack. Fixes PR5479.

llvm-svn: 90859
diff --git a/clang/test/SemaCXX/linkage-spec.cpp b/clang/test/SemaCXX/linkage-spec.cpp
index fc9b3ab..d19727a 100644
--- a/clang/test/SemaCXX/linkage-spec.cpp
+++ b/clang/test/SemaCXX/linkage-spec.cpp
@@ -40,3 +40,17 @@
 }
 using namespace pr5430;
 extern "C" void pr5430::func(void) { }
+
+// PR5404
+int f2(char *)
+{
+        return 0;
+}
+
+extern "C"
+{
+    int f2(int)
+    {
+        return f2((char *)0);
+    }
+}