================
@@ -84,12 +82,12 @@ class UnusedParametersCheck::IndexerVisitor
 public:
   IndexerVisitor(ASTContext &Ctx) { TraverseAST(Ctx); }
 
-  const std::unordered_set<const CallExpr *> &
+  const llvm::SmallPtrSetImpl<const CallExpr *> &
   getFnCalls(const FunctionDecl *Fn) {
     return Index[Fn->getCanonicalDecl()].Calls;
   }
 
-  const std::unordered_set<const DeclRefExpr *> &
+  const llvm::SmallPtrSetImpl<const DeclRefExpr *> &
----------------
localspook wrote:

Mostly to avoid repeating the "small buffer size" template parameter in the 
return type. It's not critical though, I can change it to `llvm::SmallPtrSet` 
if you feel it's more readable

https://github.com/llvm/llvm-project/pull/174357
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