[backend] modified some comments and created a shell srcipt for test inside riscv64-vms

src/RISCv64Backend.cpp

@@ -6,7 +6,7 @@
 #include <iomanip>
 #include <functional>
 
-#define DEBUG 1
+#define DEBUG 0
 #define DEEPDEBUG 0
 namespace sysy {    
 
@@ -491,7 +491,7 @@ std::vector<std::unique_ptr<RISCv64CodeGen::DAGNode>> RISCv64CodeGen::build_dag(
                 arg_node->users.push_back(call_node);
             }
         } else if (auto ret = dynamic_cast<ReturnInst*>(inst)) {
-            std::cout << "处理 RETURN 指令: " << ret->getName() << "\n"; // 调试输出
+            if (DEBUG) std::cerr << "处理 RETURN 指令: " << ret->getName() << "\n"; // 调试输出
             auto ret_node = create_node(DAGNode::RETURN, ret, value_to_node, nodes_storage); // 传递参数
             if (ret->hasReturnValue()) {
                 auto val_ir = ret->getReturnValue();