MFC: r339289: Resolve a hang in ZFS during vnode reclaimation

This is caused by a deadlock between zil_commit() and zfs_zget()
Add a way for zfs_zget() to break out of the retry loop in the common case

PR: 229614, 231117
Reported by: grembo, jhb, Andreas Sommer, others
Relnotes: yes
Sponsored by: Klara Systems