Add missing 'override'.

llvm-svn: 243773

Author: djasper-gh

clang-tools-extra/clang-tidy/misc/UnusedAliasDeclsCheck.h

@@ -22,7 +22,7 @@ class UnusedAliasDeclsCheck : public ClangTidyCheck {
       : ClangTidyCheck(Name, Context) {}
   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
-  void onEndOfTranslationUnit();
+  void onEndOfTranslationUnit() override;
 
 private:
   llvm::DenseMap<const Decl *, CharSourceRange> FoundDecls;