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

[Chuanqi Xu via cfe-commits]

================
@@ -14,3 +14,11 @@
 
 //--- test.pcm
 // CPP20WARNING-NOT: clang-cl: warning: argument unused during compilation: '/std:c++20' [-Wunused-command-line-argument]
+
+// test whether the following outputs %Hello.bmi
----------------
ChuanqiXu9 wrote:

```suggestion
// test whether the following outputs %t/Hello.bmi
```

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