Add synchronization points for triaging:

Author: oleksandr-pavlyk

dpctl/tensor/libtensor/include/kernels/sorting/topk.hpp

@@ -517,11 +517,15 @@ sycl::event topk_radix_impl(sycl::queue &exec_q,
     });
 #endif
 
+    iota_ev.wait();
+
     sycl::event radix_sort_ev =
         radix_sort_details::parallel_radix_sort_impl<IndexTy, IndexedProjT>(
             exec_q, iter_nelems, axis_nelems, workspace, tmp_tp, proj_op,
             ascending, {iota_ev});
 
+    radix_sort_ev.wait();
+
     // Write out top k of the temporary
     sycl::event write_topk_ev = exec_q.submit([&](sycl::handler &cgh) {
         cgh.depends_on(radix_sort_ev);
@@ -543,6 +547,8 @@ sycl::event topk_radix_impl(sycl::queue &exec_q,
         });
     });
 
+    write_topk_ev.wait();
+
     sycl::event cleanup_ev = exec_q.submit([&](sycl::handler &cgh) {
         cgh.depends_on(write_topk_ev);