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

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Maetveis wrote:

@tarunprabhu Continuing [our discussion on #108868](https://github.com/llvm/llvm-project/pull/108868/files/612b93eda5695306293bb8ca6e27a810b06adf3d#r1867949328) here. These are what I found, by searching for commits that added both `FlangOption` and `CLOption` to Options.td and were still reachable in the blame of the file. It is possible that this is not all of them.

The default can get quite confusing to track because IIUC the `OptionGroup`'s `Visibility` gets unioned with the visibility defined on the record.
 

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