Signal WorkerThread termination earlier

Source/core/workers/WorkerThread.cpp

Index: Source/core/workers/WorkerThread.cpp
diff --git a/Source/core/workers/WorkerThread.cpp b/Source/core/workers/WorkerThread.cpp
index 07054617e440c2a51f813553ab7228acb6e84dc3..5be4464d3cd23ed3aab1fb1704f5741ad391f8c2 100644
--- a/Source/core/workers/WorkerThread.cpp
+++ b/Source/core/workers/WorkerThread.cpp
@@ -345,12 +345,12 @@ void WorkerThread::cleanup()
     m_thread->removeTaskObserver(m_microtaskRunner.get());
     m_microtaskRunner = nullptr;
 
+    m_terminationEvent->signal();
+
     // Notify the proxy that the WorkerGlobalScope has been disposed of.
     // This can free this thread object, hence it must not be touched afterwards.
     workerReportingProxy().workerThreadTerminated();
 
-    m_terminationEvent->signal();
-
     // Clean up PlatformThreadData before WTF::WTFThreadData goes away!
     PlatformThreadData::current().destroy();
 }