Support for `std::byte`

[someonewithpc]

version / revision	Operating System	Compiler & Version	Compiler Flags	CPU
?	Linux	gcc 13.2.1 20230801	None	N/A

Testcase

#include <experimental/simd>
#include <cstddef>

int main() {
  std::experimental::native_simd<std::byte> s;
}

Actual Results

$ g++ byte.cpp
In file included from /usr/include/c++/13.2.1/experimental/simd:74,
                 from byte.cpp:1:
/usr/include/c++/13.2.1/experimental/bits/simd.h: In substitution of ‘template<class _Tp> using std::experimental::parallelism_v2::native_simd = std::experimental::parallelism_v2::simd<_Tp, std::experimental::parallelism_v2::simd_abi::native<_Tp> > [with _Tp = std::byte]’:
byte.cpp:5:43:   required from here
/usr/include/c++/13.2.1/experimental/bits/simd.h:3018:9: error: no type named ‘type’ in ‘struct std::enable_if<false, void>’
 3018 |   using native_simd = simd<_Tp, simd_abi::native<_Tp>>;
      |         ^~~~~~~~~~~

Expected Results

Compiles with support for the same operators as std::byte

Let me know if you think this is a direction worth taking and I can write a PR