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Some CUDA/HIP constants fail on device with `constexpr` since they internally rely on non-constexpr functions, e.g. ``` \#define CUDART_INF_F __int_as_float(0x7f800000) ``` This fails for cuda-clang (though passes with nvcc). These constants are currently used by `device::numeric_limits`. For portability, we need to remove `constexpr` from the affected functions. For C++11 or higher, we should be able to rely on the `std::numeric_limits` versions anyways, since the methods themselves are now `constexpr`, so should be supported on device (clang/hipcc natively, nvcc with `--expr-relaxed-constexpr`).