[llvm] [InstCombine] Fix test with experimental.guard + nounwind (NFC) (PR #67641)

[Nikita Popov via llvm-commits]

nikic wrote:

Okay, in that case I've put up a new patch that returns the willreturn attribute instead: https://github.com/llvm/llvm-project/pull/69433

https://github.com/llvm/llvm-project/pull/67641