kgzip(8) regression in RELENG_9 GENERIC

[Devin Teske]

Taking a GENERIC 9.0-RELEASE kernel and running kgzip(8) on it produces an
unusable kernel which causes immediate BTX halt in loader(8).

NOTE: This is w.r.t. a completely un-modified src-tree (including the GENERIC
config itself).

Just thought I'd share this regression.

8.1-RELEASE-p6 doesn't have this problem.

To replicate (warning DO NOT DO THIS unless you know how to recover the boot
process using either interactive loader(8) or LiveCD):

1. Install i386 9.0-RELEASE and make sure you select that you wish to unpack
"src.txz"
2. Go to /usr/src/sys/i386/compile and say: config -C -g GENERIC
3. Go to ../compile/GENERIC and say: make cleandepend && make depend && make
4. Say: kgzip kernel
5. Copy kernel.kgz to /boot
6. Add kernel="kernel.kgz" to loader.conf(5)
7. Reboot
8. Witness your own death via "BTX halted"

-- 
Devin

NOTE: Looking for confirmation from at least one other individual before filing
a PR on this one. It could be any number of factors and not a true regression.
For example, I'm using VMware Workstation 7.1 to replicate this.

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