[llvm] [mlir] [mlir][cl_parser] Support cl::Required/cl::OneOrMore flags for Pass options (PR #93570)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

> Do you have an example of what kind of problem this fixes?

I think adding tests would clarify this :)

https://github.com/llvm/llvm-project/pull/93570