Fix a problem when calling throw_with_nested with a class marked 'final'. Thanks to STL @ Microsoft for the bug report.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@232384 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/language.support/support.exception/except.nested/throw_with_nested.pass.cpp

@@ -36,6 +36,10 @@ public:
     friend bool operator==(const B& x, const B& y) {return x.data_ == y.data_;}
 };
 
+#if __cplusplus > 201103L
+struct Final final {};
+#endif
+
 int main()
 {
     {
@@ -100,4 +104,16 @@ int main()
             assert(i == 7);
         }
     }
+#if __cplusplus > 201103L
+    {
+        try
+        {
+            std::throw_with_nested(Final());
+            assert(false);
+        }
+        catch (const Final &f)
+        {
+        }
+    }
+#endif
 }