Updated ashift optimization patch

[Justin T. Gibbs]

Today I re-merged all of Spectra's ashift related changes into FreeBSD/head.  Here's the current state of the patch.  See the top of the patch for proposed commit message/justification.  The majority of it is ZFS platform agnostic.

Later this week I'll get a stock FreeBSD/head system running and run the test suites in order to verify that I haven't botched anything in the merge.  I'll also see about merging it to one of Will's Illumos VMs so I can generate a webrev.  In the mean time, comments, concerns, improvements welcome.

--
Justin

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