message: Expose StringSplitV2 ops to string_ops.cc
diff: @@ -134,6 +134,23 @@ REGISTER_OP("StringSplit")
  return Status::OK();
  });
  +REGISTER_OP("StringSplitV2")
  + .Input("input: string")
  + .Input("sep: string")
  + .Output("indices: int64")
  + .Output("values: string")
  + .Output("shape: int64")
  + .SetShapeFn([](InferenceContext* c) {
  + ShapeHandle unused;
  + TF_RETURN_IF_ERROR(c->WithRank(c->input(0), 1, &unused));
  + TF_RETURN_IF_ERROR(c->WithRank(c->input(1), 0, &unused));
  +
  + c->set_output(0, c->Matrix(InferenceContext::kUnknownDim, 2));
  + c->set_output(1, c->Vector(InferenceContext::kUnknownDim));
  + c->set_output(2, c->Vector(2));
  + return Status::OK();
  + });
  +
  REGISTER_OP("StringStrip")
  .Input("input: string")
  .Output("output: string")
  