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aio_writev: fall back to slow path if iovec is not sectorsize-aligned

Description

aio_writev: fall back to slow path if iovec is not sectorsize-aligned

However, for most disk-like devices the I/O will eventually fail anyway.
physio has the same constraints as aio_qbio. I think it might work for
zols, though; I need to add a test for that.

This commit also adds a few more test cases.

This commit add some dtrace probes, too, though I might remove those later.

Details

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asomersAuthored on
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rS368617: uipc: disable prediction in unp_pcb_lock_peer
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