K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-11-11T18:43:51.497865Z
K 7
svn:log
V 198
thread: lockless zombie list manipulation

This gets rid of the most contended spinlock seen when creating/destroying
threads in a loop. (modulo kstack)

Tested by:	alfredo (ppc64), bdragon (ppc64)

END