FreeBSD_HEAD_i386 - Build #3557 - Fixed

FreeBSD_HEAD_i386 - Build #3557 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3557/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3557/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/3557/console

Change summaries:

302567 by kib:
In vgonel(), postpone setting BO_DEAD until VOP_RECLAIM() is called,
if vnode is VMIO.  For VMIO vnodes, set BO_DEAD in vm_object_terminate().

The vnode_destroy_object(), when calling into vm_object_terminate(),
must be able to flush buffers.  BO_DEAD purpose is to quickly destroy
buffers on write when the underlying vnode is not operable any more
(one example is the devfs node after geom is gone).  Setting BO_DEAD
for reclaiming vnode before object is terminated is premature, and
results in unability to flush buffers with live SU dependencies from
vinvalbuf() in vm_object_terminate().

Reported by:	David Cross <dcrosstech_at_gmail.com>
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks

302566 by gjb:
Fix the naming of -CURRENT

Sponsored by:	The FreeBSD Foundation

302565 by cy:
r302561 broke buildworld. This patch fixes that.

MFC after:	3 days
X-MFC with:	r302561