WIP: radv: Optimize rebinding the same descriptor set.
This is the same patch as 02a43edf which was reverted because of reported hangs with Vega.
This patch greatly improves the performance in Wolfenstein:Youngblood from ~8 FPS to > 80FPS (with ACO, but LLVM has similar relations). WIP because testing is needed to figure if and why hangs might happen with Vega.