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scripts: add script to identify sources of deqp hangs

Mark Janes requested to merge majanes/mesa_jenkins:hangscript into master

This script parses dmesg, and immediately checks /proc/{PID}/cmdline to determine which qpa file corresponds to the gpu hang.

The last invoked test in the qpa file is likely the source of the hang.

Run this script on systems with:

$ dmesg -w | python3 -u identify_gpu_hang.py | tee hang_output.txt

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