[clang] lambda with template parameter crashed in unevaluated context

```cpp
template<auto F> constexpr auto x = F();
template<class> constexpr int a() { return 1; }

template <class>
struct A {
    template<typename U>
    using Func = decltype(
    []<class T>(T) {
        return x<[] constexpr { return a<T>(); }>;
    }.template operator()<unsigned long long>('2')
    );
};
A<short>::Func<int> y;
```