removing unused variables

Author: easyonaadit

llvm/lib/Target/AMDGPU/SIISelLowering.cpp

@@ -5502,12 +5502,10 @@ static MachineBasicBlock *lowerWaveReduce(MachineInstr &MI,
       MachineOperand Op1H = TII->buildExtractSubRegOrImm(
           MI, MRI, MI.getOperand(1), SrcRC, AMDGPU::sub1, SrcSubRC);
       // lane value input should be in an sgpr
-      MachineInstr *LaneValueLo =
           BuildMI(*ComputeLoop, I, DL, TII->get(AMDGPU::V_READLANE_B32),
                   LaneValueLoReg)
               .add(Op1L)
               .addReg(FF1Reg);
-      MachineInstr *LaneValueHi =
           BuildMI(*ComputeLoop, I, DL, TII->get(AMDGPU::V_READLANE_B32),
                   LaneValueHiReg)
               .add(Op1H)