[llvm] [CodeGen] Simplify updateLiveIn in MachineSink (PR #79831)

[Jay Foad via llvm-commits]

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@@ -1949,13 +1949,8 @@ static void updateLiveIn(MachineInstr *MI, MachineBasicBlock *SuccBB,
   for (unsigned DefReg : DefedRegsInCopy)
     for (MCPhysReg S : TRI->subregs_inclusive(DefReg))
       SuccBB->removeLiveIn(S);
-  for (auto U : UsedOpsInCopy) {
-    Register SrcReg = MI->getOperand(U).getReg();
-    LaneBitmask Mask;
-    for (MCRegUnitMaskIterator S(SrcReg, TRI); S.isValid(); ++S)
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jayfoad wrote:

This was added in https://reviews.llvm.org/D71132 by @alex-t.

https://github.com/llvm/llvm-project/pull/79831