[llvm] unpack packed instructions overlapped by MFMAs post-RA scheduling (PR #157968)

[Jeffrey Byrnes via llvm-commits]

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@@ -430,6 +695,7 @@ bool SIPreEmitPeephole::run(MachineFunction &MF) {
   const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
   TII = ST.getInstrInfo();
   TRI = &TII->getRegisterInfo();
+  MRI = &MF.getRegInfo();
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jrbyrnes wrote:

Why did you add this? Doesn't look like the PR uses it.

https://github.com/llvm/llvm-project/pull/157968