[clang] Match against all plugins when parsing microsoft attributes (PR #86426)

[Aaron Ballman via cfe-commits]

================
@@ -0,0 +1,61 @@
+//===- Attribute.cpp ------------------------------------------------------===//
----------------
AaronBallman wrote:

```suggestion
//===- MicrosoftAttributes.cpp --------------------------------------------===//
```

https://github.com/llvm/llvm-project/pull/86426