hg: jdk9/hs/hotspot: 8157904: Atomic::cmpxchg for jbyte is missing a fence on initial failure

[david.holmes at oracle.com]

Changeset: a8b9f9ed30ff
Author:    dholmes
Date:      2016-08-24 19:54 -0400
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/a8b9f9ed30ff

8157904: Atomic::cmpxchg for jbyte is missing a fence on initial failure
Reviewed-by: simonis, aph, kbarrett

! src/share/vm/runtime/atomic.hpp
! src/share/vm/utilities/globalDefinitions.hpp