D3D: Save some video RAM by turning off the "default" Z buffer (we create our own). probably doesn't matter on most video cards..

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4277 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoDX9/Src/main.cpp

@@ -284,7 +284,7 @@ void Shutdown()
 void DoState(unsigned char **ptr, int mode) {
 	// Clear texture cache because it might have written to RAM
 	TextureCache::Invalidate(false);
-
+	// No need to clear shader caches.
 	PointerWrap p(ptr, mode);
 	VideoCommon_DoState(p);
 }