Don't assert when instantiating member references to fields in anonymous structs.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80657 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaTemplate/instantiate-anonymous-union.cpp b/test/SemaTemplate/instantiate-anonymous-union.cpp
index 4eb5b0c..9c2467b 100644
--- a/test/SemaTemplate/instantiate-anonymous-union.cpp
+++ b/test/SemaTemplate/instantiate-anonymous-union.cpp
@@ -6,3 +6,16 @@
 
 A<int> a0;
 
+template <typename T> struct B {
+  union {
+    int a;
+    void* b;
+  };
+    
+  void f() {
+    a = 10;
+    b = 0;
+  }
+};
+
+B<int> b0;