[llvm] [DAG] foldShiftToAvg - recognize sub(x, xor(y, -1)) >> 1 as avgceil[su] (#147946) (PR #156239)

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laurenmchin wrote:

@RKSimon requesting a review when you have time, thanks

https://github.com/llvm/llvm-project/pull/156239

Previous message: [llvm] 0fa7733 - [LoopInterchange] Improve some tests (NFC) (#156426)
Next message: [llvm] [DAG] foldShiftToAvg - recognize sub(x, xor(y, -1)) >> 1 as avgceil[su] (#147946) (PR #156239)
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