message: Enable Sort for the XLA GPU backend.
  We now have an implementation of sort for the XLA GPU backend.
diff: @@ -20,10 +20,6 @@ limitations under the License.
  namespace tensorflow {
  bool GpuOpFilter(KernelDef* kdef) {
  - // TODO(b/26783907): The GPU backend currently does not implement sort.
  - if (kdef->op() == "XlaSort" || kdef->op() == "TopKV2") {
  - return false;
  - }
  if (kdef->op() == "Const") {
  AddDtypeToKernalDefConstraint("dtype", DT_STRING, kdef);
  }
  