[issue1776] vm_zeroidle: Detect movnti and enable bzeront if it is available

["Venkatesh Srinivas \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Venkatesh Srinivas <me@acm.jhu.edu> added the comment:

Now available in my git tree, branch zerothread.

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status: unread -> chatting

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