BlackRock/Vanguard are top 2 institutional holders of Qcom stock. No surprisingly they are 2nd and 3rd largest holders of BRCM.
BRCM's acquisition of Qcom is the will of capital and unstoppable from naysayers such as Cfius. Redomiciling to US is enough to shut Cfius up.
To be realistic, BRCM's bid has nothing to do with china or Chinese government. This is just a game of capital. Not only because they didn't make money on Qcom for past several years, also the need to create a new cash cow from M&A, which is especially important in current lukewarm market.