FreeBSD/src 130fffa (r354986)sys/kern vfs_mountroot.c, sys/sys systm.h

Add variant of root_mount_hold() without allocation.

It allows to use this KPI in non-sleepable contexts.

MFC after:      2 weeks
Sponsored by:   iXsystems, Inc.
DeltaFile
+43-15sys/kern/vfs_mountroot.c
+6-1sys/sys/systm.h
+49-162 files

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