Make std::forward and std::move (and std::move_if_noexcept) constexpr in C++14

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@186344 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/tuple b/include/tuple
index d8a36e6..c7a1c14 100644
--- a/include/tuple
+++ b/include/tuple
@@ -843,7 +843,7 @@
 inline _LIBCPP_INLINE_VISIBILITY
 constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept
 {
-    return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move<tuple<_Args...>>(__tup));
+    return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup));
 }
 
 #endif