[llvm] [VPlan] Verify dominance for incoming values of phi-like recipes. (PR #124838)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

I reworked the PR quite a bit and it is now building on a few additional patches:

* Add interface to retrieve incoming blocks & values + iterators, usable for all phi-like recipes: https://github.com/llvm/llvm-project/pull/129387
* Add VPIRPhi https://github.com/llvm/llvm-project/pull/129387

https://github.com/llvm/llvm-project/pull/124838