[llvm] [InstCombine] Check nowrap flags when folding comparison of GEPs with the same base pointer (PR #121892)

[via llvm-commits]

llvmbot wrote:

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Failed to cherry-pick: 9725595f3acc0c1aaa354e15ac4ee2b1f8ff4cc9

https://github.com/llvm/llvm-project/actions/runs/13097312131

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

https://github.com/llvm/llvm-project/pull/121892