[midend-mem2reg]增加遍打印方法，修复reg2mem构造函数错误

src/include/Reg2Mem.h

@@ -50,7 +50,7 @@ private:
   IRBuilder *builder; ///< IR构建器，用于插入指令
 public:
   static void *ID; ///< Pass的唯一标识符
-  Reg2Mem() : OptimizationPass("Reg2Mem", Pass::Granularity::Function), builder(builder) {}
+  Reg2Mem(IRBuilder* builder) : OptimizationPass("Reg2Mem", Pass::Granularity::Function), builder(builder) {}
   bool runOnFunction(Function *F, AnalysisManager &AM) override;
   void getAnalysisUsage(std::set<void *> &analysisDependencies, std::set<void *> &analysisInvalidations) const override;
   void *getPassID() const override { return &ID; } ///< 获取 Pass ID