Using the atomics around the vnode_create() only protected us from calls
starting in ZFS, not from other consumers (HFS+) which can also end up
calling fsync/pageout/reclaim. Since vclean() sets VL_TERMINATE before
calling all 3 VNOPs, we use vnode_isrecycled() to test for that and ignore
the request (since we know vnop_reclaim will also be called).