[CHERIoT] Eliminate dead code warning

Author: resistor

llvm/lib/Target/RISCV/RISCVExpandPseudoInsts.cpp

@@ -449,10 +449,9 @@ bool RISCVExpandPseudo::expandAuicgpInstPair(
   DebugLoc DL = MI.getDebugLoc();
   auto *MF = MBB.getParent();
 
-  bool HasTmpReg = MI.getNumOperands() > 2;
+  assert(MI.getNumOperands() <= 2);
   Register DestReg = MI.getOperand(0).getReg();
-  Register TmpReg = MI.getOperand(HasTmpReg ? 1 : 0).getReg();
-  const MachineOperand &Symbol = MI.getOperand(HasTmpReg ? 2 : 1);
+  const MachineOperand &Symbol = MI.getOperand(1);
 
   auto *NewMBB = MBB.getParent()->CreateMachineBasicBlock(MBB.getBasicBlock());
 

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -13870,7 +13870,6 @@ void RISCVTargetLowering::computeKnownBitsForTargetNode(const SDValue Op,
          " is a target node!");
 
   Known.resetAll();
-  bool IsRV64 = Subtarget.is64Bit();
   switch (Opc) {
   default: break;
   case RISCVISD::SELECT_CC: {