[clang-tools-extra] [clang-tidy] Update llvmlibc-implementation-in-namespace to new rules (PR #66504)

[via cfe-commits]

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@@ -29,16 +31,19 @@ void ImplementationInNamespaceCheck::check(
   if (!Result.SourceManager->isInMainFile(MatchedDecl->getLocation()))
     return;
 
-  if (const auto *NS = dyn_cast<NamespaceDecl>(MatchedDecl)) {
-    if (NS->getName() != RequiredNamespace) {
-      diag(NS->getLocation(), "'%0' needs to be the outermost namespace")
-          << RequiredNamespace;
-    }
+  if (auto *NS = dyn_cast<NamespaceDecl>(MatchedDecl)) {
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EugeneZelenko wrote:

`const auto *`

https://github.com/llvm/llvm-project/pull/66504