Under -fms-extensions, only inject a friend tag name when we didn't see a tag with that name in an enclosing scope.

r177473 made us correctly consider only those declarations in the
enclosing namespace scope when looking for a friend declaration. Under
ms-extensions mode, where we do some level of friend injection, this
meant that we were introducing a new tag type into a different scope
than what Microsoft actually does. Address this by only doing the
friend injection when we didn't see any tag with that name in any
outer scope. Fixes <rdar://problem/14250378>.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185100 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaCXX/MicrosoftExtensions.cpp b/test/SemaCXX/MicrosoftExtensions.cpp
index e82c47e..723beb4 100644
--- a/test/SemaCXX/MicrosoftExtensions.cpp
+++ b/test/SemaCXX/MicrosoftExtensions.cpp
@@ -365,3 +365,23 @@
 struct StructWithUnnamedMember {
   __declspec(property(get=GetV)) int : 10; // expected-error {{anonymous property is not supported}}
 };
+
+namespace rdar14250378 {
+  class Bar {};
+  
+  namespace NyNamespace {
+    class Foo {
+    public:
+      Bar* EnsureBar();
+    };
+    
+    class Baz : public Foo {
+    public:
+      friend class Bar;
+    };
+    
+    Bar* Foo::EnsureBar() {
+      return 0;
+    }
+  }
+}