[llvm] [Statepoint] Return undef value for the statepoint of the none token (PR #72552)

[Danila Malyutin via llvm-commits]

danilaml wrote:

@nunoplopes possibly. Not sure what semantics of this would be though. And this would need to be adapted to poison as well (otherwise there is no point): https://github.com/danilaml/llvm-project/commit/d693fd29f1885e72b90428999aee92573abb9c2d

https://github.com/llvm/llvm-project/pull/72552