构建IR打印器，llvm风格，跑通大部分样例(9/10)，待修复

src/include/IR.h

@@ -1106,7 +1106,7 @@ public:
     return make_range(std::next(operand_begin()), operand_end());
   }
   Value* getIndex(int index) const { return getOperand(index + 1); }
-   std::list<Value *> getAncestorIndices() const {
+  std::list<Value *> getAncestorIndices() const {
     std::list<Value *> indices;
     for (const auto &index : getIndices()) {
       indices.emplace_back(index->getValue());

src/include/SysYIRPrinter.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <string>
+#include "IR.h"
+
+namespace sysy {
+
+class SysYPrinter {
+private:
+    Module *pModule;
+
+public:
+    explicit SysYPrinter(Module *pModule) : pModule(pModule) {}
+
+public:
+    void printIR();
+    void printGlobalVariable();
+    void printFunction(Function *function);
+    void printInst(Instruction *pInst);
+    void printType(Type *type);
+    void printValue(Value *value);
+
+public:
+    static std::string getOperandName(Value *operand);
+    std::string getTypeString(Type *type);
+    std::string getValueName(Value *value);
+};
+
+}  // namespace sysy