[libc++] Add missing _LIBCPP_NODEBUG in <__type_traits/invoke.h>

libc++ doesn't run clang-tidy in the bootstrapping build, so it wasn't
run when `__builtin_invoke` was introduced. Once libc++ upgrades to a
newer clang version, clang-tidy will start to fail due to missing
`_LIBCPP_NODEBUG` annotations.

Author: philnik777

libcxx/include/__type_traits/invoke.h

@@ -65,7 +65,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 #if __has_builtin(__builtin_invoke)
 
 template <class... _Args>
-using __invoke_result_t = decltype(__builtin_invoke(std::declval<_Args>()...));
+using __invoke_result_t _LIBCPP_NODEBUG = decltype(__builtin_invoke(std::declval<_Args>()...));
 
 template <class, class... _Args>
 struct __invoke_result_impl {};
@@ -76,7 +76,7 @@ struct __invoke_result_impl<__void_t<__invoke_result_t<_Args...> >, _Args...> {
 };
 
 template <class... _Args>
-using __invoke_result = __invoke_result_impl<void, _Args...>;
+using __invoke_result _LIBCPP_NODEBUG = __invoke_result_impl<void, _Args...>;
 
 template <class... _Args>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __invoke_result_t<_Args...> __invoke(_Args&&... __args)