AMD's HyperZ Improvements Land In Mesa Git

Open-source AMD Linux users who are habitual Mesa Git users will want to pull down the latest code.

As a follow-up to yesterday's article about HyperZ fixes for R600g and RadeonSI, that code has already made it into Mesa Git. With the fixes, they are supposed to particularly help Evergreen and Cayman GPUs as well as the more-modern SI/CI/VI GCN GPUs on RadeonSI. The work re-enables HyperZ for stencil on these GPUs in the end.

Those HyperZ improvements as well as a number of other AMD changes/fixes just landed into Mesa Git and can be pulled down now for testing.