This is xnu-8019. See this file in:
Directory listing for xnu-8019//san/coverage
Makefile
kcov-blacklist
kcov-blacklist-arm64
kcov-blacklist-x86_64
kcov.c
kcov.h
kcov_data.h
kcov_ksancov.c
kcov_ksancov.h
kcov_ksancov_data.h
kcov_stksz.c
kcov_stksz.h
kcov_stksz_data.h