Antonio Sanchez fb4548e27b Implement bit_* for device.
Unfortunately `std::bit_and` and the like are host-only functions prior
to c++14 (since they are not `constexpr`).  They also never exist in the
global namespace, so the current implementation  always fails to compile via
NVCC - since `EIGEN_USING_STD` tries to import the symbol from the global
namespace on device.

To overcome these limitations, we implement these functionals here.
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