[llvm] [InstCombine] Simplify and/or of icmp eq with op replacement (PR #70335)

[Nikita Popov via llvm-commits]

nikic wrote:

I reverted this because I'm seeing segfaults in stage2 llvm-tblgen on a build server, but for some reason I can't reproduce this in local stage2 builds :/ Not sure what the difference is, my best guess is the libstdc++ version.

https://github.com/llvm/llvm-project/pull/70335