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tu: use instance indices in RD dump filenames

Zan Dobersek requested to merge zdobersek/mesa-fork:work/tu_rd_dump_name_collision into main

What does this MR do and why?

tu: use instance indices in RD dump filenames

Until now the RD dumps were stored in files on a per-device basis, using
the device index but assuming only one Vulkan instance is active. With
multiple active instances, different devices separated across those
instances could end up storing RD dumps into files with the same name.

tu_instance struct now has an index member variable that's assigned upon
creation with an incrementally-increasing global counter value. RD dump
output name now also contains this instance index, avoiding the described
naming collisions.

Signed-off-by: Zan Dobersek <zdobersek@igalia.com>

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