Kernel Scheduler: Make sure the global scheduler shutdowns correctly.

src/core/hle/kernel/kernel.cpp

@@ -116,6 +116,8 @@ struct KernelCore::Impl {
         thread_wakeup_event_type = nullptr;
         preemption_event = nullptr;
 
+        global_scheduler.Shutdown();
+
         named_ports.clear();
     }
 

src/core/hle/kernel/scheduler.cpp

@@ -342,6 +342,14 @@ bool GlobalScheduler::AskForReselectionOrMarkRedundant(Thread* current_thread, T
     }
 }
 
+void GlobalScheduler::Shutdown() {
+    for (std::size_t core = 0; core < NUM_CPU_CORES; core++) {
+        scheduled_queue[core].clear();
+        suggested_queue[core].clear();
+    }
+    thread_list.clear();
+}
+
 GlobalScheduler::~GlobalScheduler() = default;
 
 Scheduler::Scheduler(Core::System& system, Core::ARM_Interface& cpu_core, u32 core_id)

src/core/hle/kernel/scheduler.h

@@ -147,6 +147,8 @@ public:
         return reselection_pending.load();
     }
 
+    void Shutdown();
+
 private:
     bool AskForReselectionOrMarkRedundant(Thread* current_thread, Thread* winner);
 
@@ -189,6 +191,11 @@ public:
         return context_switch_pending;
     }
 
+    void Shutdown() {
+        current_thread = nullptr;
+        selected_thread = nullptr;
+    }
+
 private:
     friend class GlobalScheduler;
     /**