kib 112e7bceca Correct fences for sys/refcount.h.
The acq barrier in refcount_acquire() has no use, constructor must
ensure that the changes are visible before publication by other means.
Last release must sync/with the constructor and all updaters.

This is based on the refcount/shared_ptr analysis I heard at the Hans
Boehm and Herb Sutter talks about C++ atomics.

Reviewed by:	alc, jhb, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D11270
2017-06-30 16:16:21 +00:00
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