[llvm] [ValueTracking] Add support for `trunc nuw/nsw` in isKnowNonZero (PR #89643)

[Yingwei Zheng via llvm-commits]

https://github.com/dtcxzyw requested changes to this pull request.

This patch causes opt to crash :(
I will provide a reproducer later.


https://github.com/llvm/llvm-project/pull/89643