Don't hide rbegin/rend for GPU.
Although they don't work on GPU, guarding them out leads to compile errors.
We'll get a compile error if anyone tries to use rbegin/rend on device,
but that was never supported anyways.
Fixes #2797 (closed).
Although they don't work on GPU, guarding them out leads to compile errors.
We'll get a compile error if anyone tries to use rbegin/rend on device,
but that was never supported anyways.
Fixes #2797 (closed).