[SYCL][Unit] Fix flaky unittests failure on Windows

sycl/source/detail/device_impl.hpp

@@ -2318,10 +2318,20 @@ class device_impl {
   void unregisterQueue(queue_impl *Q) {
     std::lock_guard<std::mutex> Lock(MQueuesMutex);
     auto It = std::find(MQueues.begin(), MQueues.end(), Q);
-    assert(It != MQueues.end() && "Queue not found in device's queue list");
-    // Swap with last element and pop — O(1) removal, order doesn't matter.
-    std::swap(*It, MQueues.back());
-    MQueues.pop_back();
+
+    // device_impl can be destroyed before queue_impl in unittests.
+    // On Windows, unittests involving host tasks race with scheduler
+    // cleanup (invoked by ~UrMock). UrMock constructor destroys the
+    // platform cache, along with device_impl. Now, when two unittests
+    // involving host tasks run one after another, URMock destructor of
+    // first can race with URMock constructor of second, causing device_impl
+    // to not have registered queue.
+    if (It != MQueues.end()) {
+      // Swap with last element and pop — O(1) removal,
+      // order doesn't matter.
+      std::swap(*It, MQueues.back());
+      MQueues.pop_back();
+    }
   }
 
 private:

sycl/unittests/scheduler/InOrderQueueHostTaskDeps.cpp

@@ -127,12 +127,7 @@ TEST_F(SchedulerTest, InOrderQueueCrossDeps) {
   EXPECT_EQ(std::get<1>(ExecutedCommands[2]) /*EventsCount*/, 0u);
 }
 
-#ifdef _WIN32
-// https://github.com/intel/llvm/issues/22412
-TEST_F(SchedulerTest, DISABLED_InOrderQueueCrossDepsShortcutFuncs) {
-#else
 TEST_F(SchedulerTest, InOrderQueueCrossDepsShortcutFuncs) {
-#endif
   ExecutedCommands.clear();
   sycl::unittest::UrMock<> Mock;
   mock::getCallbacks().set_before_callback(