Newport Wafer Fab, a microchip plant based in Wales, has a potential buyer that is making the British government nervous — the Chinese-owned semiconductor maker Nexperia. In fact, the possible sale of this small company with just 450 employees is worrisome enough for U.K. Prime Minister Boris Johnson to have ordered a review on national security grounds. The U.K.’s concerns are the latest example of the way foreign governments have grown suspicious of Chinese companies shopping for domest