Implement some tests for defaulted constructors. To do this I had to
suppress an error we were previously emitting on valid union code.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@131440 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaCXX/default-constructor-initializers.cpp b/test/SemaCXX/default-constructor-initializers.cpp
index 9da8556..e783f49 100644
--- a/test/SemaCXX/default-constructor-initializers.cpp
+++ b/test/SemaCXX/default-constructor-initializers.cpp
@@ -59,3 +59,10 @@
   struct S { const int x; ~S(); };
   const S arr[2] = { { 42 } };
 }
+
+// This is valid
+union U {
+  const int i;
+  float f;
+};
+U u;