[RISCV] Remove unused variables in RISCVISelDAGToDAG.cpp (NFC)

/Users/jiefu/llvm-project/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp:97:33: error: unused variable 'FuncInfo' [-Werror,-Wunused-variable]
      RISCVMachineFunctionInfo *FuncInfo =
                                ^
/Users/jiefu/llvm-project/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp:106:29: error: unused variable 'TLI' [-Werror,-Wunused-variable]
      const TargetLowering &TLI = CurDAG->getTargetLoweringInfo();
                            ^
2 errors generated

llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp

@@ -94,16 +94,13 @@ void RISCVDAGToDAGISel::PreprocessISelDAG() {
              Lo.getValueType() == MVT::i32 && Hi.getValueType() == MVT::i32 &&
              "Unexpected VTs!");
       MachineFunction &MF = CurDAG->getMachineFunction();
-      RISCVMachineFunctionInfo *FuncInfo =
-          MF.getInfo<RISCVMachineFunctionInfo>();
       SDLoc DL(N);
 
       // Create temporary stack for each expanding node.
       SDValue StackSlot =
           CurDAG->CreateStackTemporary(TypeSize::Fixed(8), Align(4));
       int FI = cast<FrameIndexSDNode>(StackSlot.getNode())->getIndex();
       MachinePointerInfo MPI = MachinePointerInfo::getFixedStack(MF, FI);
-      const TargetLowering &TLI = CurDAG->getTargetLoweringInfo();
 
       SDValue Chain = CurDAG->getEntryNode();
       Lo = CurDAG->getStore(Chain, DL, Lo, StackSlot, MPI, Align(8));