I think US would force it to go through if it happens. The combined entity would be a US version of Huawei.I agree that U.S. is probably OK with it. But the regulatory body which killed a lot of recent semi M&As is in China.

Huawei is quietly dominating China’s semiconductor supply chain
Huawei is emerging as the leader of China’s national team in semiconductors, dominating chip manufacturing and seeking to integrate the country’s entire supply chain. Its ambitions stem from both its placement on the US Entity List and strong government support at the national and local level...