[llvm] [SelectOpt] Add handling for not conditions. (PR #92517)

[Sjoerd Meijer via llvm-commits]

https://github.com/sjoerdmeijer commented:

> Usually these are canonicalized in instcombine to remove the not and invert the true/false values, but this will not happen for Loginal operations

Just wanted to quickly check the reason instcombine isn't doing canonicalisations for these cases. I guess it's because the limited scope that instcombine has, so it won't trigger, is that right?

https://github.com/llvm/llvm-project/pull/92517