Only add UIView nodes to Yoga where they are enabled

Summary:
Only add UIView nodes to Yoga where they are enabled.

We check for it in `isLeaf` but I think we should also check for them in the check for sub views.
Closes https://github.com/facebook/yoga/pull/609

Reviewed By: emilsjolander

Differential Revision: D5643387

Pulled By: dshahidehpour

fbshipit-source-id: a85c62b6b2e0120b2913e7f2df8b094d43ca49a6

YogaKit/Source/YGLayout.m

@@ -361,7 +361,7 @@ static void YGAttachNodesFromViewHierachy(UIView *const view)
 
     NSMutableArray<UIView *> *subviewsToInclude = [[NSMutableArray alloc] initWithCapacity:view.subviews.count];
     for (UIView *subview in view.subviews) {
-      if (subview.yoga.isIncludedInLayout) {
+      if (subview.yoga.isEnabled && subview.yoga.isIncludedInLayout) {
         [subviewsToInclude addObject:subview];
       }
     }