Fix http://llvm.org/bugs/show_bug.cgi?id=11461.  Credit Alberto Ganesh Barbati.

llvm-svn: 146345
diff --git a/libcxx/include/ext/hash_map b/libcxx/include/ext/hash_map
index f6a11f0..bebdccb 100644
--- a/libcxx/include/ext/hash_map
+++ b/libcxx/include/ext/hash_map
@@ -215,7 +215,11 @@
 
 using namespace std;
 
-template <class _Tp, class _Hash, bool = is_empty<_Hash>::value>
+template <class _Tp, class _Hash, bool = is_empty<_Hash>::value
+#if __has_feature(is_final)
+                                         && !__is_final(_Hash)
+#endif
+        >
 class __hash_map_hasher
     : private _Hash
 {
@@ -247,7 +251,11 @@
         {return __hash_(__x);}
 };
 
-template <class _Tp, class _Pred, bool = is_empty<_Pred>::value>
+template <class _Tp, class _Pred, bool = is_empty<_Pred>::value
+#if __has_feature(is_final)
+                                         && !__is_final(_Pred)
+#endif
+         >
 class __hash_map_equal
     : private _Pred
 {