message: Add VLOG to confirm kernel_gen launches.
  This is intended to help the common cases of confirming the kernel_gen kernels are being used or to see the shape of the kernel.
diff: @@ -107,6 +107,7 @@ class MlirOp : public OpKernel {
  input_descs.push_back(
  std::move(ConvertTensorToDescriptor<InputDataType>(ctx->input(i))));
  }
  + VLOG(4) << ctx->op_kernel().TraceString(*ctx, true);
  auto result_desc = Kernel::Invoke(ctx, input_descs);
  for (const auto& input_desc : input_descs) {
  free(input_desc.descriptor);
  