Add temporary debugging code to dump entire JS heap at shutdown to debug bug 538462.

js/src/xpconnect/src/nsXPConnect.cpp

@@ -153,6 +153,14 @@ nsXPConnect::~nsXPConnect()
         mRuntime->SystemIsBeingShutDown(cx);
 
         JS_EndRequest(cx);
+
+        // Temporary code to debug a persistent leak on tinderbox
+        // unit tests (bug 538462).
+#if defined(DEBUG_cltbld) && defined(XP_MACOSX)
+        printf("Dump of entire JS heap at shutdown:\n");
+        JS_DumpHeap(cx, stdout, nsnull, 0, nsnull, size_t(-1), nsnull);
+#endif
+
         JS_DestroyContext(cx);
     }