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

[Chuanqi Xu via cfe-commits]

https://github.com/ChuanqiXu9 approved this pull request.

Given the problem is important (I've heard the problem for clang-cl with modules several times) and the author have been active on this direction for years, I think I can trust him even if I can't test it actually. So LGTM.

I'll land this one week later if no objection or new comments come in, @sharadhr remind me that time if I forget it somehow.

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