minor: Make note in log if scene was restarted due to an unrecoverable physics error

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -740,7 +740,12 @@ namespace OpenSim.Region.Framework.Scenes
             //
             // Out of memory
             // Operating system has killed the plugin
-            m_sceneGraph.UnRecoverableError += RestartNow;
+            m_sceneGraph.UnRecoverableError 
+                += () => 
+                    { 
+                        m_log.ErrorFormat("[SCENE]: Restarting region {0} due to unrecoverable physics crash", Name); 
+                        RestartNow(); 
+                    };
 
             RegisterDefaultSceneEvents();