I can confirm that tjaalton's above test packages fix the problem on a Skylake laptop with an i7-6700 CPU and an Nvidia 970m GPU when using the nouveau driver.
I installed libllvm3.8_3.8-2ubuntu1.1_amd64.deb from a VT then rebooted, and now I have working Unity again.
I can confirm that tjaalton's above test packages fix the problem on a Skylake laptop with an i7-6700 CPU and an Nvidia 970m GPU when using the nouveau driver.
I installed libllvm3. 8_3.8-2ubuntu1. 1_amd64. deb from a VT then rebooted, and now I have working Unity again.