[ASDisplayNode] Improve locking in ASDisplayNode (facebookarchive#3172)

* Improve locking in ASDisplayNode

* Address first bunch of comments

* Changed `view` and `layer` methods for locking

* Adress comments

Author: maicki

Source/ASCellNode.mm

@@ -118,12 +118,12 @@ - (void)layoutDidFinish
   _viewControllerNode.frame = self.bounds;
 }
 
-- (void)_locked_rootNodeDidInvalidateSize
+- (void)_rootNodeDidInvalidateSize
 {
   if (_interactionDelegate != nil) {
     [_interactionDelegate nodeDidInvalidateSize:self];
   } else {
-    [super _locked_rootNodeDidInvalidateSize];
+    [super _rootNodeDidInvalidateSize];
   }
 }