message: GuaranteeConst is a NoOp for the op_level_cost_estiamtor.
diff: @@ -27,6 +27,7 @@ namespace grappler {
  constexpr int kOpsPerMac = 2;
  constexpr char kConst[] = "Const";
  +constexpr char kGuaranteeConst[] = "GuaranteeConst";
  constexpr char kConv2d[] = "Conv2D";
  constexpr char kConv2dBackpropFilter[] = "Conv2DBackpropFilter";
  constexpr char kConv2dBackpropInput[] = "Conv2DBackpropInput";
  @@ -205,6 +206,7 @@ OpLevelCostEstimator::OpLevelCostEstimator() {
  {kBatchMatMul, wrap(&OpLevelCostEstimator::PredictBatchMatMul)},
  {kNoOp, wrap(&OpLevelCostEstimator::PredictNoOp)},
  + {kGuaranteeConst, wrap(&OpLevelCostEstimator::PredictNoOp)},
  {kGather, wrap(&OpLevelCostEstimator::PredictGatherOrSlice)},
  {kGatherV2, wrap(&OpLevelCostEstimator::PredictGatherOrSlice)},
  