[CUSOLVER] workaround for issue #216

[ericlars]

RE: #215

[JackAKirk]

Unfortunately this does not work because it is actually syncing the queue before the command group associated with this onemkl_cusolver_host_task is submitted: The result is that I find this does not solve #216

[JackAKirk]

Interestingly I find that replacing queue.wait() with a change to host_task_internal:

static inline void host_task_internal(H &cgh, sycl::queue queue, F f) {
    cgh.interop_task([f, queue](sycl::interop_handler ih) {
        auto sc = CusolverScopedContextHandler(queue, ih);
        f(sc);
        auto handle = sc.get_handle(queue);
        cusolverStatus_t err;
        cudaStream_t currentStreamId;
        CUSOLVER_ERROR_FUNC(cusolverDnGetStream, err, handle, &currentStreamId);
        cuStreamSynchronize(currentStreamId);
    });
}

is also not solving #216. It seems that you have to either call cuStreamSynchronize from within the user facing onemkl_cusolver_host_task or call queue.wait() after the command group is submitted.