alloc: reduce number of large pages to 256.
[ccan] / ccan / idtree /
drwxr-xr-x   ..
-rw-r--r-- 1334 _info
-rw-r--r-- 7865 idtree.c
-rw-r--r-- 2987 idtree.h
drwxr-xr-x - test