coroutine: use QSIMPLEQ instead of QTAILQ
CoQueue do not need to remove any element but the head of the list; processing is always strictly FIFO. Therefore, the simpler singly-linked QSIMPLEQ can be used instead. Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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