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

[Sharadh Rajaraman via cfe-commits]

sharadhr wrote:

Fair point. Added a test. Additionally the CMake repository contains a bigger battery of tests that also all pass with this PR.

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