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

[Mel Chen via llvm-commits]

https://github.com/Mel-Chen commented:

I support unification AnyOf. 
But I don't think non-arithmetical reduction (min/max, AnyOf, FindLast...etc.) needs `getOpcode`. I think a better approach is to remove the dependence of non-arithmetical reduction on `getOpcode` and then start to unify AnyOf.
Here is my first step https://github.com/llvm/llvm-project/pull/118777.

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