[clang-tools-extra] [clang-tidy][NFC] optimize unused using decls performance (PR #110200)

[Congcong Cai via cfe-commits]

================
@@ -25,6 +25,13 @@ AST_MATCHER_P(DeducedTemplateSpecializationType, 
refsToTemplatedDecl,
   return false;
 }
 
+AST_MATCHER_P(Type, getTagDecl, 
clang::ast_matchers::internal::Matcher<TagDecl>,
+              DeclMatcher) {
+  if (const auto *ND = Node.getAsTagDecl())
----------------
HerrCai0907 wrote:
```suggestion
  if (const TagDecl *ND = Node.getAsTagDecl())
```

https://github.com/llvm/llvm-project/pull/110200
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