N3644 support for <unordered_set> and <unordered_map>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187915 91177308-0d34-0410-b5e6-96231b3b80d8

include/__hash_table

@@ -112,6 +112,9 @@ public:
                                                          pointer;
 
     _LIBCPP_INLINE_VISIBILITY __hash_iterator() _NOEXCEPT
+#if _LIBCPP_STD_VER > 11
+    : __node_(nullptr)
+#endif
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         __get_db()->__insert_i(this);
@@ -248,6 +251,9 @@ public:
     typedef __hash_iterator<__non_const_node_pointer> __non_const_iterator;
 
     _LIBCPP_INLINE_VISIBILITY __hash_const_iterator() _NOEXCEPT
+#if _LIBCPP_STD_VER > 11
+    : __node_(nullptr)
+#endif
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         __get_db()->__insert_i(this);