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

[Carl Ritson via llvm-commits]

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@@ -3947,14 +3947,34 @@ 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 auto killDef = [&](SlotIndex OldDefIdx) -> void {
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perlfu wrote:

This variable should be called `OldUseIdx`. 

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