Index: llvm/lib/Support/Parallel.cpp
===================================================================
--- llvm/lib/Support/Parallel.cpp
+++ llvm/lib/Support/Parallel.cpp
@@ -89,7 +89,7 @@
   void add(std::function<void()> F) override {
     {
       std::lock_guard<std::mutex> Lock(Mutex);
-      WorkStack.push(F);
+      WorkStack.push(std::move(F));
     }
     Cond.notify_one();
   }
@@ -102,7 +102,7 @@
       Cond.wait(Lock, [&] { return Stop || !WorkStack.empty(); });
       if (Stop)
         break;
-      auto Task = WorkStack.top();
+      auto Task = std::move(WorkStack.top());
       WorkStack.pop();
       Lock.unlock();
       Task();
@@ -161,7 +161,7 @@
 void TaskGroup::spawn(std::function<void()> F) {
   if (Parallel) {
     L.inc();
-    Executor::getDefaultExecutor()->add([&, F] {
+    Executor::getDefaultExecutor()->add([&, F = std::move(F)] {
       F();
       L.dec();
     });