rsx: Optionally sync on texture read semaphore

- Some games use texture semaphore for zcull sync which is rather bizzare.
  However, it works on realhw as the depth test happens before fragment shader completion
- Due to the high performance penalty incurred by this act, this
behavior is only enabled by the "strict rendering mode" option.

rpcs3/Emu/RSX/rsx_methods.cpp

@@ -219,6 +219,10 @@ namespace rsx
 		{
 			// Pipeline barrier seems to be equivalent to a SHADER_READ stage barrier
 			rsx::g_dma_manager.sync();
+			if (g_cfg.video.strict_rendering_mode)
+			{
+				rsx->sync();
+			}
 
 			// lle-gcm likes to inject system reserved semaphores, presumably for system/vsh usage
 			// Avoid calling render to avoid any havoc(flickering) they may cause from invalid flush/write