Simplify looping in case of spurious wakeups

Author: qwwdfsad

kotlinx-coroutines-core/jvm/src/scheduling/CoroutineScheduler.kt

@@ -709,11 +709,10 @@ internal class CoroutineScheduler(
                 return
             }
             assert { localQueue.size == 0 }
-            while (inStack()) {
+            workerCtl.value = PARKED // Update value once
+            while (inStack()) { // Prevent spurious wakeups
                 if (isTerminated || state == WorkerState.TERMINATED) break
                 tryReleaseCpu(WorkerState.PARKING)
-                workerCtl.value = PARKED
-                if (!inStack()) return
                 interrupted() // Cleanup interruptions
                 park()
             }