I’ve uploaded Mesa 12.0.4 for xenial and yakkety to my testing PPA for you to try out. 16.04 shipped with 11.2.0 so it’s a slightly bigger update there, while yakkety is already on 12.0.3 but the new version should give radeon users a 15% performance boost in certain games with complex shaders.
Please give it a spin and report to the (yakkety) SRU bug if it works or not, and mention the GPU you tested with. At least Intel Skylake seems to still work fine here.
The ppa now has 12.0.5 for both xenial & yakkety. There have been no comments to the SRU bug about success/failure, so feel free to add a comment here instead.