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

[Tarun Prabhu via cfe-commits]

tarunprabhu wrote:

I checked and I don't think there are any others that have been accidentally enabled. Are there any tests that check to these options produce warnings? If not, it might be worth adding them. What do you think?

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