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

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

@mathstuf in https://github.com/llvm/llvm-project/issues/140825#issuecomment-2900112555 , xmake dev said he can fix the problem by `/clang:-o`. I am wondering if you can did similar thing in CMake if there is an argument?

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