[llvm] AMDGPU: Update live intervals in convertToThreeAddress (PR #104610)

[Carl Ritson via llvm-commits]

================
@@ -3934,18 +3934,38 @@ MachineInstr *SIInstrInfo::convertToThreeAddress(MachineInstr &MI,
       (ST.getConstantBusLimit(Opc) > 1 || !Src0->isReg() ||
        !RI.isSGPRReg(MBB.getParent()->getRegInfo(), Src0->getReg()))) {
     MachineInstr *DefMI;
-    const auto killDef = [&]() -> void {
-      const MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
+    const auto killDef = [&](SlotIndex OldUseIdx) -> void {
----------------
perlfu wrote:

`OldUseIdx` is no longer required in this version.

https://github.com/llvm/llvm-project/pull/104610