[llvm] [SelectionDAG] Handle more opcodes in canCreateUndefOrPoison (PR #84921)

[Björn Pettersson via llvm-commits]

bjope wrote:

> As this updated some tests, I've had to revert it while reverting #85932. I've put the details on that PR.
> 
> If this is actually unrelated to that feel free to reland, I just wasn't going to to be able to resolve the test file conflict myself so I went with the safest option.

Re-applied in https://github.com/llvm/llvm-project/commit/55c6bda01ef5a166a69b43956775272d9d67bda5

https://github.com/llvm/llvm-project/pull/84921