[llvm] [InstCombine] Extend `foldICmpAddConstant` to disjoint `or`. (PR #75899)

[Mikhail Gudim via llvm-commits]

mgudim wrote:

@dtcxzyw 

> Sorry, I cannot provide a reduced test since it is hard to do semantic-preserving reduction.
It seems that we lose the information %retval.0.i32 >= 0.

No worries. I'll take a look, but sometime later. I'm in the middle of something else right now.

https://github.com/llvm/llvm-project/pull/75899