[clang][analyzer] Remove a copy in a loop in VAListChecker (#162620)

Co-authored-by: Gabor Horvath <[email protected]>

Author: 2 people

clang/lib/StaticAnalyzer/Checkers/VAListChecker.cpp

@@ -149,7 +149,7 @@ void VAListChecker::checkPreCall(const CallEvent &Call,
   else if (VaEnd.matches(Call))
     checkVAListEndCall(Call, C);
   else {
-    for (auto FuncInfo : VAListAccepters) {
+    for (const auto &FuncInfo : VAListAccepters) {
       if (!FuncInfo.Func.matches(Call))
         continue;
       const MemRegion *VAList =