[llvm] [GISel][CombinerHelper] Combine and(trunc(x), trunc(y)) -> trunc(and(x, y)) (PR #89023)

[Dhruv Chawla via llvm-commits]

dc03-work wrote:

> Instcombine handles freeze separately. We are going to follow that pattern:
> 
> https://github.com/llvm/llvm-project/blob/dc8f6a8cdad427345a60f5142411617df521c303/llvm/lib/Analysis/InstructionSimplify.cpp#L6935

 Okay, I guess that would be the visit here: https://github.com/llvm/llvm-project/blob/dc8f6a8cdad427345a60f5142411617df521c303/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp#L4481? I believe my patch would require porting https://github.com/llvm/llvm-project/blob/dc8f6a8cdad427345a60f5142411617df521c303/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp#L4298 to the Combiner.

https://github.com/llvm/llvm-project/pull/89023