[backend-LAG]添加新的LargeArrayToGlobal中端Pass，以及栈保护逻辑

src/include/midend/Pass/Optimize/LargeArrayToGlobal.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "../Pass.h"
+
+namespace sysy {
+
+class LargeArrayToGlobalPass : public OptimizationPass {
+public:
+    static void *ID;
+
+    LargeArrayToGlobalPass() : OptimizationPass("LargeArrayToGlobal", Granularity::Module) {}
+
+    bool runOnModule(Module *M, AnalysisManager &AM) override;
+    void *getPassID() const override {
+        return &ID;
+    }
+
+private:
+    unsigned calculateTypeSize(Type *type);
+    void convertAllocaToGlobal(AllocaInst *alloca, Function *F, Module *M);
+    std::string generateUniqueGlobalName(AllocaInst *alloca, Function *F);
+};
+
+} // namespace sysy

src/include/midend/Pass/Pass.h

@@ -279,7 +279,7 @@ private:
   IRBuilder *pBuilder;
 
 public:
-  PassManager() = default;
+  PassManager() = delete;
   ~PassManager() = default;
 
   PassManager(Module *module, IRBuilder *builder) : pmodule(module) ,pBuilder(builder), analysisManager(module) {}