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

[Nikita Popov via llvm-commits]

nikic wrote:

I don't think there is an easy way to *only* add disjoint. I just did this manually where necessary (e.g. eecb99c5f66c8491766628a2925587e20f3b1dbd adds it to about a hundred tests).

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