[llvm] [InstCombine] Try optimizing with knownbits which determined from Cond (PR #91762)

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ParkHanbum wrote:

I'm not good enough. sorry for waste time. I wonder if SpecialKnownBits related codes are acceptable. 
if then I'll create new PR for only contains SpecialKnownBits related. 

https://github.com/llvm/llvm-project/pull/91762