Replace int_div_ceil with cuda::std::ceil

[sleeepyjack]

we can probably remove

cuCollections/include/cuco/detail/utility/math.cuh

Line 38 in 6816740

__host__ __device__ constexpr T int_div_ceil(T dividend, U divisor) noexcept

and use cuda::std::ceil instead

Originally posted by @PointKernel in #630 (comment)

[willtryagain]

Hello,

what header file to include for cuda::std::ceil?

should we delete the math.cuh file as no other functions defined?

[PointKernel]

Hi @willtryagain, std::ceil is defined in the cmath header per https://en.cppreference.com/w/cpp/numeric/math/ceil. Similarly, cuda::std::ceil can be found in the cuda/std/cmath header. Once all instances of int_div_ceil are replaced with cuda::std::ceil, we can remove the detail math.cuh file.