cuda::barrier::try_wait* should be const

[ahendriksen]

From https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2643r1.html:

template <class CF>
bool barrier<CF>::try_wait(arrival_token& tok) const; // <-- const
template <class CF, class Rep, class Period>
bool barrier<CF>::try_wait_for(arrival_token& tok, duration<Rep, Period> const& rel_time) const; // <-- const
template <class CF, class Clock, class Duration>
bool barrier<CF>::try_wait_until(arrival_token& tok, time_point<Clock, Duration> const& abs_time) const; // <-- const

// Available since C++20
// bool latch::try_wait() const noexcept;
template <class Rep, class Period>
bool latch::try_wait_for(duration<Rep, Period> const& rel_time) const;
template <class Clock, class Duration>
bool latch::try_wait_until(time_point<Clock, Duration> const& abs_time) const;

The current implementation of these functions is not const: https://github.com/NVIDIA/libcudacxx/blob/a57dbed580e49b14ac1ad7f98496176407208aa4/include/cuda/std/detail/libcxx/include/__cuda/barrier.h#L528

The functions should also take the arrival token by reference (instead of moving). I filed PR NVIDIA/libcudacxx#499 for that.

[github-actions]

Hi @ahendriksen!

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