[llvm] [SeperateConstOffsetFromGEP] Handle `or disjoint` flags (PR #76997)

[Craig Topper via llvm-commits]

topperc wrote:

> Huh. I was reading commit logs that implied that that wasn't the case yet. I can adjust

It's not inferred in SelectionDAG yet. Maybe you read the log from one of my SelectionDAG commits?

https://github.com/llvm/llvm-project/pull/76997