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Fix the gpu hang in CS-GO game

Yang requested to merge Yang/mesa:cs-go into main

In CS-GO game the depth buffer format changed frequently between D16_UNORM and D32_FLOAT. And it finally hit gpu hang when format is D16_UNORM but bit 13 of 7018h is still 0. This patch add one RT flush and CS stall before depth buffer format changed. Patch is verified by CS-GO game for about 40 hours.

Signed-off-by: Yang Shi yang.a.shi@intel.com

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