Add more dy2st ut2 (#49881)

* add test for composite with dy2st

* add more log

paddle/fluid/operators/elementwise/elementwise_mul_op.cc

@@ -88,6 +88,7 @@ class ElementwiseMulGradCompositeOpMaker
         static_cast<int>(this->Attr<int>("axis")),
         x_grad_p,
         y_grad_p);
+    VLOG(3) << "Runing mul_grad composite func";
     this->RecoverOutputName(x_grad, x_grad_name);
     this->RecoverOutputName(y_grad, y_grad_name);
   }

paddle/fluid/operators/expand_v2_op.cc

@@ -206,6 +206,7 @@ class ExpandV2GradCompositeOpMaker : public prim::GradCompositeOpMakerBase {
     auto shape = this->Attr<std::vector<int>>("shape");
     prim::expand_grad<prim::DescTensor>(
         x, out_grad, paddle::experimental::IntArray(shape), x_grad_p);
+    VLOG(3) << "Runing expand_v2 composite func";
     this->RecoverOutputName(x_grad, x_grad_name);
   }
 };

paddle/fluid/operators/reduce_ops/reduce_sum_op.cc

@@ -84,7 +84,7 @@ class ReduceSumCompositeGradOpMaker : public prim::GradCompositeOpMakerBase {
 
     // get output orginal name
     std::string x_grad_name = this->GetOutputName(x_grad_t);
-
+    VLOG(3) << "Runing sum_grad composite func";
     // call composite backward func
     prim::sum_grad<prim::DescTensor>(
         x, out_grad, axis, keep_dim, reduce_all, x_grad);