Function mem_prefetch_async_v2 

pub fn mem_prefetch_async_v2(
    dev_ptr: CUdeviceptr,
    count: usize,
    location: CUmemLocation,
    flags: u32,
    stream: CUstream,
) -> Result<(), GpuError>

Prefetch [dev_ptr .. dev_ptr+count) to a target memory location on stream. Wraps cuMemPrefetchAsync_v2 (the v2 shape that takes a CUmemLocation).