[llvm] [Attributor] Fix an issue that could potentially cause `AccessList` and `OffsetBins` out of sync (PR #106187)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

I don't believe the claim that llvm-reduce can't further reduce it. Can you post it 

https://github.com/llvm/llvm-project/pull/106187