swr: [rasterizer archrast] move to pass by value

Move to pass by value since most events are very small in size.

We can look at pass by reference but will need to create multiple
versions to handle temp objects.

Reviewed-by: Bruce Cherniak <bruce.cherniak@intel.com>

src/gallium/drivers/swr/rasterizer/scripts/templates/ar_eventhandler_h.template

@@ -43,7 +43,7 @@ namespace ArchRast
         virtual ~EventHandler() {}
 
 % for name in protos['event_names']:
-        virtual void Handle(${name}&& event) {}
+        virtual void Handle(${name} event) {}
 % endfor
     };
 }

src/gallium/drivers/swr/rasterizer/scripts/templates/ar_eventhandlerfile_h.template

@@ -128,7 +128,7 @@ namespace ArchRast
 % for name in protos['event_names']:
         //////////////////////////////////////////////////////////////////////////
         /// @brief Handle ${name} event
-        virtual void Handle(${name}&& event)
+        virtual void Handle(${name} event)
         {
 % if protos['events'][name]['num_fields'] == 0:
             Write(${protos['events'][name]['event_id']}, (char*)&event.data, 0);