K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2018-03-20T15:51:05.100248Z
K 7
svn:log
V 370
Drop KTR_CONTENTION.

It is incomplete, has not been adopted in the other locking primitives,
and we have other means of measuring lock contention (lock_profiling,
lockstat, KTR_LOCK). Drop it to slightly de-clutter the mutex code and
free up a precious KTR class index.

Reviewed by:	jhb, mjg
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D14771

END