MFC r289192: 6281 prefetching should apply to 1MB reads

MFC r289192: 6281 prefetching should apply to 1MB reads

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Alexander Motin <mav@freebsd.org>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Justin Gibbs <gibbs@scsiguy.com>
Reviewed by: Xin Li <delphij@freebsd.org>
Approved by: Gordon Ross <gordon.ross@nexenta.com>
Author: George Wilson <george.wilson@delphix.com>

illumos/illumos-gate@632802744ef6d17e06d6980a95f631615c3b060f

git-svn-id: svn://svn.freebsd.org/base/stable/10@290748 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f