anv: Depth bounds testing fixups

Closed Plamena Manolova requested to merge pmanolova/mesa:wip/depth-bounds-fixups into master

There were some issues with depth bounds patches that I missed. Since the patches are already in master I made a new MR with fixes for the issues pointed out here: !2444 (comment 277367) and here: 939ddccb (comment 277347)

@jljusten @jekstrand @llandwerlin @kwg

Edited by Plamena Manolova

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