[llvm] [ValueTracking] Infer nonzero from assumed masked value (PR #224709)

[Andreas Jonson via llvm-commits]

andjo403 wrote:

as seen in the https://github.com/dtcxzyw/llvm-opt-benchmark-nightly/pull/1492 there is no [real world usefulness](https://llvm.org/docs/InstCombineContributorGuide.html#real-world-usefulness) so do not know if there is any point for more reviews.

but the test is not changed to work in instsimplify and are now not testing anything, and there are other test that are failing

https://github.com/llvm/llvm-project/pull/224709