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

[Dhruv Chawla via llvm-commits]

dc03-work wrote:

> #89363

This fixes the case for `G_FREEZE %x` when `%x` is known non-undef non-poison. However, this doesn't handle the case we're looking at here, because I'm not eliminating the freeze, I am pushing it through the trunc. So, I am not sure how this PR is relevant here...

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