[llvm] [InstCombine] Propagate poison pow[i] (PR #146750)

[Nikita Popov via llvm-commits]

https://github.com/nikic requested changes to this pull request.

I don't want to add more of these one-off special cases which result in different poison-propagation support between ValueTracking, ConstantFolding and InstSimplify. I've put up https://github.com/llvm/llvm-project/pull/146878 to consolidate ValueTracking and ConstantFolding. We can then do the same for InstSimplify. And then this should just become a matter of adding extra intrinsics to the list.

https://github.com/llvm/llvm-project/pull/146750