[midend-mem2reg]修改函数参数定义引入argument类，显示为参数创建alloca和store指令

src/SysYIRCFGOpt.cpp

@@ -85,7 +85,7 @@ bool SysYCFGOptUtils::SysYBlockMerge(Function *func) {
         // std::cout << "merge block: " << blockiter->get()->getName() << std::endl;
         BasicBlock* block = blockiter->get();
         BasicBlock* nextBlock = blockiter->get()->getSuccessors()[0];
-        auto nextarguments = nextBlock->getArguments();
+        // auto nextarguments = nextBlock->getArguments();
         // 删除br指令
         if (block->getNumInstructions() != 0) {
           auto thelastinstinst = block->end();
@@ -108,12 +108,6 @@ bool SysYCFGOptUtils::SysYBlockMerge(Function *func) {
           block->getInstructions().emplace_back(institer->release());
           institer = nextBlock->getInstructions().erase(institer);   
         }
-        // 合并参数
-        // TODO：是否需要去重?
-        for (auto &argm : nextarguments) {
-          argm->setParent(block);
-          block->insertArgument(argm);
-        }
         // 更新前驱后继关系，类似树节点操作
         block->removeSuccessor(nextBlock);
         nextBlock->removePredecessor(block);