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

[Aaron Puchert via cfe-commits]

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@@ -26,6 +26,7 @@ namespace clang {
 class AnalysisDeclContext;
 class FunctionDecl;
 class NamedDecl;
+class Attr;
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aaronpuchert wrote:

Seems unused? But maybe you intend to use it later. If you do, make sure to keep forward declarations in alphabetical order.

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