Merge pull request #19292 from jrose-apple/get-out-the-map

Minor improvements to the use of StringMap/StringSet

lib/Driver/ToolChains.cpp

@@ -504,7 +504,7 @@ void ToolChain::JobContext::addFrontendCommandLineInputArguments(
     const bool mayHavePrimaryInputs, const bool useFileList,
     const bool usePrimaryFileList, const bool filterByType,
     ArgStringList &arguments) const {
-  llvm::StringSet<> primaries;
+  llvm::DenseSet<StringRef> primaries;
 
   if (mayHavePrimaryInputs) {
     for (const Action *A : InputActions) {