Summary: @public GCC up until v7 flags our way of reading edges in `YGNodeSetStyleInputs` as unused variables. I managed to work around that by rearranging the casts a bit. Reviewed By: SidharthGuglani Differential Revision: D14299439 fbshipit-source-id: eec0266185504d1b790b9ef574bd4a83c0059d3a