BufferCache: Implement OnCPUWrite and SyncGuestHost

src/video_core/dma_pusher.cpp

@@ -21,6 +21,7 @@ MICROPROFILE_DEFINE(DispatchCalls, "GPU", "Execute command buffer", MP_RGB(128,
 void DmaPusher::DispatchCalls() {
     MICROPROFILE_SCOPE(DispatchCalls);
 
+    gpu.SyncGuestHost();
     // On entering GPU code, assume all memory may be touched by the ARM core.
     gpu.Maxwell3D().OnMemoryWrite();