[midend]修复函数参数alloca指令创建错误导致的段错误，修复irprint对argument的识别

src/SysYIRGenerator.cpp

@@ -408,7 +408,7 @@ std::any SysYIRGenerator::visitFuncDef(SysYParser::FuncDefContext *ctx){
   auto funcArgs = function->getArguments();
   std::vector<AllocaInst *> allocas;
   for (int i = 0; i < paramActualTypes.size(); ++i) {
-    AllocaInst *alloca = builder.createAllocaInst(paramActualTypes[i], {}, paramNames[i]);
+    AllocaInst *alloca = builder.createAllocaInst(Type::getPointerType(paramActualTypes[i]), {}, paramNames[i]);
     allocas.push_back(alloca);
     module->addVariable(paramNames[i], alloca);
   }

src/SysYIRPrinter.cpp

@@ -72,6 +72,8 @@ std::string SysYPrinter::getValueName(Value *value) {
     return std::to_string(constVal->getInt());
   } else if (auto constVar = dynamic_cast<ConstantVariable*>(value)) {
     return constVar->getName(); // 假设ConstantVariable有自己的名字或通过getByIndices获取值
+  } else if (auto argVar = dynamic_cast<Argument*>(value)) {
+    return "%" + argVar->getName(); // 假设ArgumentVariable有自己的名字
   }
   assert(false && "Unknown value type or unable to get value name");
   return "";