clone `isComment` when cloneVNode (#5633)
clone `isComment` when cloneVNode (#5633)


lizhiyao/vue,xueyaodeai/vue,cnchanning/vue,KingMario/vue,cnchanning/vue,xueyaodeai/vue,Ddder-FE/vue,Hanks10100/vue,Ddder-FE/vue,Jinjiang/vue,KingMario/vue,optimizely/vue,Ddder-FE/vue,lizhiyao/vue,Kingwl/vue,xueyaodeai/vue,Hanks10100/vue,vuejs/vue,KingMario/vue,lizhiyao/vue,Jinjiang/vue,xueyaodeai/vue,Kingwl/vue,Ddder-FE/vue,Kingwl/vue,KingMario/vue,Jinjiang/vue,vuejs/vue,vuejs/vue,Hanks10100/vue,cnchanning/vue,Kingwl/vue,Hanks10100/vue,lizhiyao/vue,vuejs/vue,Jinjiang/vue