[llvm] [GlobalIsel] Combine zext of trunc (episode II) (PR #108305)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

The DAG has the known bits part:
https://github.com/llvm/llvm-project/blob/4ddc756bccb34f3d07e30c9ca96bba32cb0cf4f9/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp#L14011

I am not sure that it has the `and` combines.


Thanks for taking a look!

https://github.com/llvm/llvm-project/pull/108305