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radv: improve GPU hang report and replace RADV_TRACE_FILE by RADV_DEBUG=hang

Samuel Pitoiset requested to merge hakzsam/mesa:radv_improve_hang_report into master

Instead of printing various stuff to stderr/stdout, the driver now creates a directory into HOME/radv_dumps_pid if a GPU hang is detected and it dumps logs. This also adds UMR GFX ring/waves dumps.

The main change for users is that RADV_TRACE_FILE is deprecated and replaced by RADV_DEBUG=hang, the famous trace file will be dumped to HOME/radv_dumps_pid/trace.log.

Edited by Samuel Pitoiset

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