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

[Erich Keane via cfe-commits]

================
@@ -345,6 +345,9 @@ Bug Fixes to Compiler Builtins
 Bug Fixes to Attribute Support
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+- Clang now correctly matches plugin attributes with microsoft ``[attribute]`` syntax.
----------------
erichkeane wrote:

Should this be double-brackets?
```suggestion
- Clang now correctly matches plugin attributes with Microsoft ``[attribute]`` syntax.
```



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