[clang] [clang-tools-extra] [clang-tidy][use-internal-linkage]fix false positives for ExportDecl (PR #117901)

[Julian Schmidt via cfe-commits]

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@@ -926,6 +926,8 @@ AST Matchers
 - Ensure ``hasName`` matches template specializations across inline namespaces,
   making `matchesNodeFullSlow` and `matchesNodeFullFast` consistent.
 
+- Add ``exportDecl`` matches export declaration.
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5chmidti wrote:

> Add a `exportDecl` matcher to match export declarations.

https://github.com/llvm/llvm-project/pull/117901