[midend]通过编译，TODO：验证正确性

src/CMakeLists.txt

@@ -22,7 +22,9 @@ add_executable(sysyc
   SysYIRGenerator.cpp
   SysYIRPrinter.cpp
   SysYIRCFGOpt.cpp
-  # SysYIRAnalyser.cpp
+  Pass.cpp
+  Dom.cpp
+  Liveness.cpp
   # DeadCodeElimination.cpp
   AddressCalculationExpansion.cpp
   # Mem2Reg.cpp