Latest macppc GENERIC hangs

[Jeff Rizzo <riz%tastylime.net@localhost>]

Something in the recent PPC churn is causing problems on macppc;  the 
kernel hangs right after printing available memory:


Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 5.99.44 (GENERIC) #2: Tue Jan 18 15:49:20 PST 2011
        
riz%hack.lan@localhost:/Users/riz/Documents/code/netbsd/obj/sys/arch/macppc/compil
e/GENERIC
total memory = 1024 MB
avail memory = 985 MB
<hang>


...macppc was unbuildable for a few days until a recent fix;  this hang 
was immediately evident (even before the 5.99.44 bump) in the latest 
autobuild.

+j