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

[Mikhail Gudim via llvm-commits]

mgudim wrote:

@dtcxzyw Is the diff shown for output of the optimizer before / after my optimization. If so, where is the original source of the benchmark?

Basically, I am asking for steps to reproduce the regression.

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