ls eat high CPU time when LANG=zh_CN.UTF-8 and LC_ALL=zh_CN.UTF-8

[Huang Wen Hui]

Hi,
On very recent CURRENT, ls can eat high CPU time when LANG=zh_CN.UTF-8 and
LC_ALL=zh_CN.UTF-8:

% uname -a
FreeBSD mbp.gddsn.org.cn 11.0-ALPHA6 FreeBSD 11.0-ALPHA6 #121 r302331M: Mon
Jul  4 10:47:27 CST 2016     root at mbp.gddsn.org.cn:/usr/obj/usr/src/sys/MACBOOK
 amd64

top show:
4457 hwh           1 100    0 16784K  4416K CPU4    4   0:22  98.86% ls

any ideas?

Huang Wen Hui