[Bug 233414] [PowerPC64] OPTIONS DEBUG_MEMGUARD results in unbootable kernel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233414

--- Comment #12 from Sean Bruno <sbruno at FreeBSD.org> ---
(In reply to Mark Johnston from comment #10)
Just so that its clear, this patch works for me on the Tyan P8 in the cluster. 
I can boot a MemGuard kernel and turn the knobs on/off.  I'll leave it to you
folks to decide if how you want to commit the fixes.

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FreeBSD 13.0-CURRENT #0 r342079M: Fri Dec 14 13:41:21 UTC 2018
   
sbruno at build-13.freebsd.org:/usr/obj/powerpc.powerpc64/usr/src/sys/CLUSTER13
powerpc
gcc version 4.2.1 20070831 patched [FreeBSD]
WARNING: WITNESS option enabled, expect reduced performance.
MEMGUARD DEBUGGING ALLOCATOR INITIALIZED:
        MEMGUARD map base: 0xe000000001024000
        MEMGUARD map size: 3355444 KBytes
VT: init without driver.
cpu0: IBM POWER8 revision 2.0, 4024.00 MHz
cpu0: Features
dc007182<PPC32,PPC64,ALTIVEC,FPU,MMU,SMT,ISNOOP,ARCH205,ARCH206,VSX,TRUELE>
cpu0: Features2 ef000000<ARCH207,HTM,DSCR,ISEL,TAR,VCRYPTO,HTMNOSC>


As for debugging the original panic, I've set sysctl vm.memguard.desc="128
Bucket"

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