K 10
svn:author
V 6
andrew
K 8
svn:date
V 27
2020-01-09T10:26:36.948064Z
K 7
svn:log
V 196
Add atomic_testandset/clear on arm64.

These will reportedly be used in future uma changes.

MFC after:	2 weeks
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D23019

END