[XPU] fc pass and delete pass nodes check (#60314)

Author: gitliuyf

paddle/fluid/framework/ir/xpu/delete_isolated_node_pass.cc

@@ -100,7 +100,7 @@ void DeleteIsolatedNodePass::CollectReservedPersistableNodeNames(
     std::unordered_set<std::string>* reserved_persistable_node_names) const {
   for (auto* node : graph->Nodes()) {
     if (!node || node->Name() == "fetch" || node->Name() == "feed") continue;
-    if (!node->IsVar() || !node->Var()->Persistable()) continue;
+    if (!node->IsVar() || !node->Var() || !node->Var()->Persistable()) continue;
     for (auto* out_node : node->outputs) {
       auto op_type = out_node->Op()->Type();
       if (control_flow_op_input_map_.count(op_type) == 0) {
@@ -135,7 +135,7 @@ int DeleteIsolatedNodePass::RemoveIsolatedNodes(
   const std::unordered_set<ir::Node*> nodes = graph->Nodes();
   for (auto* node : nodes) {
     if (!node || node->Name() == "fetch" || node->Name() == "feed") continue;
-    if (!node->IsVar() || !node->Var()->Persistable()) continue;
+    if (!node->IsVar() || !node->Var() || !node->Var()->Persistable()) continue;
     auto name = node->Var()->Name();
     if (reserved_persistable_node_names.count(name) > 0) continue;
     delete_nodes.insert(node);

paddle/fluid/framework/ir/xpu/pass_utils.cc

@@ -64,7 +64,7 @@ int ConvertActivationType(std::string act_type) {
 
 Node* FindNodeWithName(Graph* graph, std::string name) {
   for (auto* node : graph->Nodes()) {
-    if (node->IsVar() && node->Var()->Name() == name) {
+    if (node->IsVar() && node->Var() && node->Var()->Name() == name) {
       return node;
     }
   }