[llvm] [VPlan] Add hidden `-vplan-print-after-all` option (PR #175839)

[Luke Lau via llvm-commits]

https://github.com/lukel97 commented:

Could we split this PR into two? One that just changes runPass to print afterwards, and then in a separate one we could look at migrating other transforms to use runPass.



https://github.com/llvm/llvm-project/pull/175839