[clang] [clang] WIP: Warn on mismatched RequiresCapability attributes (PR #67520)

[Aaron Puchert via cfe-commits]

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@@ -3978,7 +3978,9 @@ def warn_acquired_before : Warning<
 def warn_acquired_before_after_cycle : Warning<
   "cycle in acquired_before/after dependencies, starting with '%0'">,
   InGroup<ThreadSafetyAnalysis>, DefaultIgnore;
-
+def warn_attribute_mismatch : Warning<
+  "attribute mismatch between function definition and declaration of %0">,
+  InGroup<ThreadSafetyAnalysis>, DefaultIgnore;
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aaronpuchert wrote:

```suggestion
  InGroup<ThreadSafetyAttributes>, DefaultIgnore;
```

https://github.com/llvm/llvm-project/pull/67520