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

[Amara Emerson via llvm-commits]

aemerson wrote:

> Can you try doing this with the new tablegen combiner support?

I don't think we can encode some of the pointer type in this patch checks in that, right?

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