[clang] [clang-cl][flang][dxc] Fix opts exposed to clang-cl/dxc by mistake (PR #118640)

[Mészáros Gergely via cfe-commits]

Maetveis wrote:

> I checked and I don't think there are any others that have been accidentally enabled.

Thanks.

> Are there any tests that check to these options produce warnings? If not, it might be worth adding them. What do you think?

No there aren't any, and yes I agree, I will add them to this PR once we figure out if I should include `-Xlinker` and `-fdiagnostics-color=`.

https://github.com/llvm/llvm-project/pull/118640