[RISCV64] Add live variable analysis pass

Author: hiraditya

llvm/lib/Target/RISCV/CMakeLists.txt

@@ -51,6 +51,7 @@ add_llvm_target(RISCVCodeGen
   RISCVISelLowering.cpp
   RISCVLandingPadSetup.cpp
   RISCVLateBranchOpt.cpp
+  RISCVLiveVariables.cpp
   RISCVLoadStoreOptimizer.cpp
   RISCVMachineFunctionInfo.cpp
   RISCVMakeCompressible.cpp

llvm/lib/Target/RISCV/RISCV.h

@@ -97,6 +97,9 @@ void initializeRISCVLoadStoreOptPass(PassRegistry &);
 FunctionPass *createRISCVZacasABIFixPass();
 void initializeRISCVZacasABIFixPass(PassRegistry &);
 
+FunctionPass *createRISCVLiveVariablesPass();
+void initializeRISCVLiveVariablesPass(PassRegistry &);
+
 InstructionSelector *
 createRISCVInstructionSelector(const RISCVTargetMachine &,
                                const RISCVSubtarget &,