[llvm] [AMDGPU] Fix undefined scc register in successor block of SI_KILL terminators (PR #134718)

[Matt Arsenault via llvm-commits]

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@@ -47,6 +47,8 @@ static std::pair<bool, bool> runImpl(MachineFunction &MF) {
   const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
   const TargetLowering *TLI = MF.getSubtarget().getTargetLowering();
 
+  TLI->finalizeLowering(MF);
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arsenm wrote:

This API is bad. We probably should split these into separate steps, but given no tests apparently rely on this order I guess this is fine for now 

https://github.com/llvm/llvm-project/pull/134718