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

[Dhruv Chawla via llvm-commits]

dc03-work wrote:

> Should move this to tablegen patterns

@arsenm Which file would this be? I had tried searching for something like this originally but couldn't find anything.

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