Fix absolute positioning in reverse wrapping container

Summary: aligning with odd web behaviour

Reviewed By: gkassabli

Differential Revision: D5144145

fbshipit-source-id: da6ef999ec0aabacf499017d1cfa81fc8f66e4bd

yoga/Yoga.c

@@ -1714,7 +1714,7 @@ static void YGNodeAbsoluteLayoutChild(const YGNodeRef node,
          child->layout.measuredDimensions[dim[crossAxis]]) /
         2.0f;
   } else if (!YGNodeIsLeadingPosDefined(child, crossAxis) &&
-             YGNodeAlignItem(node, child) == YGAlignFlexEnd) {
+             (YGNodeAlignItem(node, child) == YGAlignFlexEnd || node->style.flexWrap == YGWrapWrapReverse)) {
     child->layout.position[leading[crossAxis]] = (node->layout.measuredDimensions[dim[crossAxis]] -
                                                   child->layout.measuredDimensions[dim[crossAxis]]);
   }