Extra zone data consists of:
- custom zone name,
- zone text,
- zone callstack index.
If neither of these data values is stored in zone, 5 bytes are saved. If
any one of them is required, extra 4 bytes are added, for an index into
extra data array.
Memory savings:
android 2371 MB -> 2324 MB
big 7593 MB -> 6747 MB
chicken 1687 MB -> 1501 MB
drl-l-b 1119 MB -> 1013 MB
long 4289 MB -> 4190 MB
q3bsp-mt 4399 MB -> 3918 MB
q3bsp-st 1067 MB -> 1027 MB
raytracer 6057 MB -> 5342 MB
selfprofile 1177 MB -> 1079 MB
tracy-dynamic 4489 MB -> 4013 MB
tracy-static 16.2 GB -> 14.3 GB