[llvm] [InstCombine] optimize unnecessary sext instruction with add + cmp (PR #152291)

[Gaurav Dhingra via llvm-commits]

gxyd wrote:

Apologies @RKSimon , I'm not working on this anymore. I was quite frustrated with not being able to fix the issue after spending a lot of time from my end, and I gave up on it.

Someone else can pickup the issue.

https://github.com/llvm/llvm-project/pull/152291