This is xnu-8019. See this file in:
Directory listing for xnu-8019//osfmk/mach_debug
Makefile
hash_info.h
ipc_info.h
lockgroup_info.h
mach_debug.h
mach_debug.modulemap
mach_debug_types.defs
mach_debug_types.h
page_info.h
vm_info.h
zone_info.h