[llvm] [VPlan] Change parent of VPReductionRecipe to VPRecipeWithIRFlags. NFC (PR #130881)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

Would probably be good to make this independent of https://github.com/llvm/llvm-project/pull/130880, even if it requires some printing test updates.

https://github.com/llvm/llvm-project/pull/130881