This is xnu-8019. See this file in:
Directory listing for xnu-8019//tools
Makefile
cocci/
cred_dump_backtraces.c
cred_dump_creds.c
entropy_health_test_bounds.py
kt-dump/
lldbmacros/
lockstat/
remote_build.sh
symbolify.py
tests/
trace/
xcrun_cache.sh