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

[via cfe-commits]

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

Microsoft attributes use single brackets, c++11 attributes use `[[]]`

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