[llvm] [InstCombine] Preserve disjoint or after folding casted bitwise logic (PR #136815)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> That can handle the case logicop+sext/zext whether or not the src types are the same in one place.

Please add some tests as suggested in https://github.com/llvm/llvm-project/pull/136815#discussion_r2055315987

https://github.com/llvm/llvm-project/pull/136815