[IRPrinter&DCE]修改定义方便调试打印，在DEC中增加调试信息

src/include/DeadCodeElimination.h

@@ -2,6 +2,8 @@
 
 #include "IR.h"
 #include "SysYIRAnalyser.h"
+#include "SysYIRPrinter.h"
+
 namespace sysy {
 
 class DeadCodeElimination {

src/include/SysYIRPrinter.h

@@ -15,15 +15,16 @@ public:
 public:
     void printIR();
     void printGlobalVariable();
-    void printFunction(Function *function);
-    void printInst(Instruction *pInst);
-    void printType(Type *type);
-    void printValue(Value *value);
+    
 
 public:
+    static void printFunction(Function *function);
+    static void printInst(Instruction *pInst);
+    static void printType(Type *type);
+    static void printValue(Value *value);
     static std::string getOperandName(Value *operand);
-    std::string getTypeString(Type *type);
-    std::string getValueName(Value *value);
+    static std::string getTypeString(Type *type);
+    static std::string getValueName(Value *value);
 };
 
 }  // namespace sysy