[IR]修复初始化数组指令的逻辑，更新IR常量定义。

src/CMakeLists.txt

@@ -23,10 +23,10 @@ add_executable(sysyc
   SysYIRPrinter.cpp
   SysYIROptPre.cpp
   SysYIRAnalyser.cpp
-  DeadCodeElimination.cpp
+  # DeadCodeElimination.cpp
   AddressCalculationExpansion.cpp
-  Mem2Reg.cpp
-  Reg2Mem.cpp
+  # Mem2Reg.cpp
+  # Reg2Mem.cpp
   RISCv64Backend.cpp
 )