SHANGHAI — Chinese tech giant Huawei on Monday touted a new approach to developing advanced semiconductors despite U.S. sanctions, as Nvidia struggles to sell its high-end chips in China. Huawei said it developed a new engineering approach called "LogicFolding" to manufacture its Kirin smartphone chips this fall. That breakthrough comes as Nvidia faces U.S. export restrictions in China and Apple contends with renewed competition from Huawei in the world's second-largest consumer economy. Huawei'