[llvm] AMDGPU: Mark the SCC def dead when expanding CF pseudos (PR #226249)

[Jay Foad via llvm-commits]

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@@ -249,17 +251,17 @@ void SILowerControlFlow::emitIf(MachineInstr &MI) {
 
   MachineInstr *And =
       BuildMI(MBB, I, DL, TII->get(LMC.AndOpc), Tmp).addReg(CopyReg).add(Cond);
+  setImpSCCDefDead(*And, /*IsDead=*/true);
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jayfoad wrote:

#226406 would avoid repeating `/*IsDead=*/true` in this patch.

https://github.com/llvm/llvm-project/pull/226249