One more regression i forgot to fill bug about so to mention are GPU faults
with The Talos Principle or Serious Sam 3... produce a lot of these right upon
starting a game and continue...

[  823.723639] radeon 0000:00:01.0: GPU fault detected: 146 0x0006200c
[  823.723649] radeon 0000:00:01.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR  
0x00000000
[  823.723652] radeon 0000:00:01.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS
0x0602000C

 Mesa bisect goes to 860b658b97f859ee7d0dd076a8ac0332601ffa65

 radeonsi: move clip plane constant buffer to RW buffers