[llvm] IVDesc: unify RecurKinds IAnyOf and FAnyOf (PR #118393)

[David Sherwood via llvm-commits]

david-arm wrote:

> Gentle ping.

I'm not entirely sure how to review this patch since @Mel-Chen created an alternative PR #118777. It's confusing to have two alternative versions being conducted in parallel, since then I don't know which to review! However, since you created this PR first I think it makes sense for you to continue with it. I'll try to take a look soon!

https://github.com/llvm/llvm-project/pull/118393