!5773 [AutoParallel]Fix Reduce_eliminate_pass bug

Merge pull request !5773 from lichen/fix_reduce_eliminate_pass

mindspore/ccsrc/frontend/optimizer/irpass/reduce_eliminate.h

@@ -72,6 +72,15 @@ class ReduceOneEliminater : public AnfVisitor {
       }
       auto new_shape = std::make_shared<ValueTuple>(elements);
       auto reshape_op = prim::GetPythonOps("reshape", "mindspore.ops.functional")->cast<PrimitivePtr>();
+      auto node_abstract = node->abstract();
+      // handle auto_parallel get nullptr abstract
+      if (node_abstract != nullptr) {
+        auto new_base_shape = std::make_shared<abstract::Shape>(GetValue<std::vector<int>>(new_shape));
+        node_abstract->set_shape(new_base_shape);
+        auto new_node = node->func_graph()->NewCNode({NewValueNode(reshape_op), x_, NewValueNode(new_shape)});
+        new_node->set_abstract(node_abstract);
+        return new_node;
+      }
       return node->func_graph()->NewCNode({NewValueNode(reshape_op), x_, NewValueNode(new_shape)});
     }