[PM] Wire up support for explicitly running the verifier pass.

The required functionality has been there for some time, but I never
managed to actually wire it into the command line registry of passes.
Let's do that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225144 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed