kern: devirtualize most things that are free to devirtualize (see #1672)

libraries/libmesosphere/include/mesosphere/kern_k_thread.hpp

@@ -620,7 +620,7 @@ namespace ams::kern {
             void Finalize();
 
             virtual bool IsSignaled() const override;
-            virtual void OnTimer() override;
+            void OnTimer();
             virtual void DoWorkerTask() override;
         public:
             static constexpr bool IsConditionVariableThreadTreeValid() {
@@ -674,4 +674,8 @@ namespace ams::kern {
         GetCurrentThread().SetClosedObject(this);
     }
 
+    ALWAYS_INLINE void KTimerTask::OnTimer() {
+        static_cast<KThread *>(this)->OnTimer();
+    }
+
 }