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

[Ben Boeckel via cfe-commits]

mathstuf wrote:

That was discussed on Discourse. If/when `clang-cl` starts writing and reading MSVC-compatible BMIs, it can use the same flags. Until then, it would be very weird to use `-ifcOutput` for `clang-cl` when it is not using the IFC format at all.

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