DolphinQt: JIT Widget Refresh

Fulfilling a certain six-year-old todo.

Source/Core/DolphinQt/Host.h

@@ -40,6 +40,8 @@ signals:
   void RequestStop();
   void RequestRenderSize(int w, int h);
   void UpdateDisasmDialog();
+  void JitCacheCleared();
+  void JitProfileDataWiped();
   void PPCSymbolsChanged();
   void PPCBreakpointsChanged();