[llvm] [InstCombine] Add transforms for `(or/and (icmp eq/ne X,0),(icmp eq/ne X,Pow2OrZero))` (PR #94648)

[Nikita Popov via llvm-commits]

nikic wrote:

Did this fold produce *any* positive diffs? It seems like it's always either neutral (inverting a predicate) or a regression, but maybe I didn't see some.

https://github.com/llvm/llvm-project/pull/94648