[VPlan] Add helper to run VPlan passes, verify after run (NFC). (#123640) Add new runPass helpers to run a VPlan transformation. This makes it easier to add additional checks/functionality for each transform run. In this patch, an option is added to run the verifier after each VPlan transform. Follow-ups will use the same helper to also support printing VPlans after each transform. Note that the verifier at the moment requires there to be a canonical IV and vector loop region, so the final lowering transforms aren't run via runPass yet. PR: https://github.com/llvm/llvm-project/pull/123640
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