Add static constant ASInterfaceStateInHierarchy which we'll return if the node is not in a cell but its view is in a window

AsyncDisplayKit/ASDisplayNode.h

@@ -41,18 +41,32 @@ typedef void (^ASDisplayNodeDidLoadBlock)(ASDisplayNode *node);
 typedef NS_OPTIONS(NSUInteger, ASInterfaceState)
 {
   /** The element is not predicted to be onscreen soon and preloading should not be performed */
-  ASInterfaceStateNone          = 1 << 0,
+  ASInterfaceStateNone          = 0,
   /** The element may be added to a view soon that could become visible.  Measure the layout, including size calculation. */
-  ASInterfaceStateMeasureLayout = 1 << 1,
+  ASInterfaceStateMeasureLayout = 1 << 0,
   /** The element is likely enough to come onscreen that disk and/or network data required for display should be fetched. */
-  ASInterfaceStateFetchData     = 1 << 2,
+  ASInterfaceStateFetchData     = 1 << 1,
   /** The element is very likely to become visible, and concurrent rendering should be executed for any -setNeedsDisplay. */
-  ASInterfaceStateDisplay       = 1 << 3,
+  ASInterfaceStateDisplay       = 1 << 2,
   /** The element is physically onscreen by at least 1 pixel.
    In practice, all other bit fields should also be set when this flag is set. */
-  ASInterfaceStateVisible       = 1 << 4,
+  ASInterfaceStateVisible       = 1 << 3,
 };
 
+/**
+ * Currently we only set `interfaceState` for
+ * nodes contained in table views or collection views.
+ 
+ * Nodes that aren't contained in cells will be in this state when
+ * they are in the view hierarchy, and `ASInterfaceStateNone` when
+ * they aren't.
+ */
+static const ASInterfaceState ASInterfaceStateInHierarchy =
+    ASInterfaceStateMeasureLayout
+  | ASInterfaceStateFetchData
+  | ASInterfaceStateDisplay
+  | ASInterfaceStateVisible;
+
 /**
  * An `ASDisplayNode` is an abstraction over `UIView` and `CALayer` that allows you to perform calculations about a view
  * hierarchy off the main thread, and could do rendering off the main thread as well.