[clang] Accept `cl`-style output arguments (`/Fo`, `-Fo`) for `--fmodule-output` (PR #121046)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> > Why is this submitted against the release/19.x branch? Is this a backport? If so, please indicate which commit it backports.
> 
> Not a backport but a new commit. I have now re-submitted it against `main`, but I'd like it back-ported to `19.x` if possible.

It is better to fix the test failures (or announce they are not relevant with your pr)

https://github.com/llvm/llvm-project/pull/121046