cache computed varobjs for pointers to prevent infinite loops for circularly linked lists

package.json

@@ -71,7 +71,7 @@
         "c9.ide.find": "#35379124ca",
         "c9.ide.find.infiles": "#c132ad243c",
         "c9.ide.find.replace": "#44772dd796",
-        "c9.ide.run.debug": "#62691215d8",
+        "c9.ide.run.debug": "#d1b818fa35",
         "c9.automate": "#47e2c429c9",
         "c9.ide.ace.emmet": "#6dc4585e02",
         "c9.ide.ace.gotoline": "#a8ff07c8f4",