[llvm] [MachineLateInstrsCleanup] Reuse redundant spill-slot reloads (PR #220180)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

Thanks for the update!

I don't quite understand your stats: you added another stat in the file - did you sum them together then in the table?

This is what I am seeing now on SystemZ across SPEC2017:
```
     21574            machine-latecleanup - Number of redundant instructions removed.
      2740            machine-latecleanup - Number of redundant spill-slot reloads removed.
```


https://github.com/llvm/llvm-project/pull/220180