Partially enable leak reports for objects

Cycle leaks are currently not reported, because this needs further
work.

The last GC run has been moved to run earlier (before the object
store free), so that array cycles that hold references to objects
don't show up as leaks. Fingers crossed that this doesn't adversely
affect anything else.

Zend/zend_execute_API.c

@@ -331,6 +331,12 @@ void shutdown_executor(void) /* {{{ */
 		zend_close_rsrc_list(&EG(regular_list));
 	} zend_end_try();
 
+#if ZEND_DEBUG
+	if (GC_G(gc_enabled) && !CG(unclean_shutdown)) {
+		gc_collect_cycles();
+	}
+#endif
+
 	zend_try {
 		zend_objects_store_free_object_storage(&EG(objects_store));