qom: Use atomics for object refcounting
Object reference counts will soon be changed outside the BQL. So we need to use atomics in object_ref/unref. Based on a patch by Liu Ping Fan. Signed-off-by: NLiu Ping Fan <qemulist@gmail.com> Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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