[llvm] [GlobalISel] Combine (X == 0) & (Y == 0) -> (X | Y) == 0 (PR #69017)

[Dávid Ferenc Szabó via llvm-commits]

dfszabo wrote:

> > Seems like the BB's parent is nullptr, don't know why though.
> 
> Can you post a separate PR with this version for easier debugging?

Yes, here you go https://github.com/llvm/llvm-project/pull/71949. I commented also my findings so far.

https://github.com/llvm/llvm-project/pull/69017