Merge pull request swiftlang#36392 from artemcm/BatchScannerResetOptionOccurences

[DependencyScanning] Reset LLVM option occurences for each batch scan entry

Author: artemcm

lib/DependencyScan/ScanDependencies.cpp

@@ -982,6 +982,11 @@ forEachBatchEntry(CompilerInstance &invocationInstance,
       // those of the current scanner invocation.
       updateCachedInstanceOpts(*pInstance, invocationInstance, entry.arguments);
     } else {
+      // We must reset option occurences because we are handling an unrelated command-line
+      // to those parsed before. We must do so because LLVM options parsing is done
+      // using a managed static `GlobalParser`.
+      llvm::cl::ResetAllOptionOccurrences();
+
       // Create a new instance by the arguments and save it in the map.
       subInstanceMap->insert(
           {entry.arguments,