[clang] [flang] [Clang][Driver][Test] Created test for unsupported driver options (PR #120900)

[Mészáros Gergely via cfe-commits]

Maetveis wrote:

Hey @GeorgeKA, there's still some unaddressed comments from my previous review, I thought you were still working on it, so I did not want to post more comments. I realize the latency I'm taking to respond is dragging this out quite a bit. If you're okay with it I can implement some of them myself. Github allows to do this by opening a pull request against this branch in your fork of the repository.

https://github.com/llvm/llvm-project/pull/120900