[llvm] [InstCombine] Fold comparison of adding two z/sext booleans (PR #67895)

[Nikita Popov via llvm-commits]

nikic wrote:

I'd suggest to also add a (negative) test where the sext/zext is from something other than i1. (Unless it already exists and I missed it...)

https://github.com/llvm/llvm-project/pull/67895