[yoga re-add assertion to check for owner reference before adding child.

Summary: this diff re-add the assertion to check for owner reference before adding child that was removed by mistake in previous diff

Reviewed By: emilsjolander

Differential Revision: D7495417

fbshipit-source-id: b81174aeea3f2796d76ccdae4a8eddd0beace0aa

yoga/Yoga.cpp

@@ -370,6 +370,11 @@ void YGConfigCopy(const YGConfigRef dest, const YGConfigRef src) {
 }
 
 void YGNodeInsertChild(const YGNodeRef node, const YGNodeRef child, const uint32_t index) {
+  YGAssertWithNode(
+      node,
+      child->getOwner() == nullptr,
+      "Child already has a owner, it must be removed first.");
+
   YGAssertWithNode(
       node,
       node->getMeasure() == nullptr,