weird ufs corruption on amd64

['Kockac' Matej Kubik]

Hello again,
I've been adviced by one friend to try older version of -current and
after couple of days recompiling and recompiling I think I've been able
to pinpoint the cause... well maybe not really pinpoint but it's about
1500-lines of diff -u.
At this moment I'm using -current cvsupped with date=2007.06.15.00.00.00
Kernel with date=2007.06.16.04.00.00 works, but 20070616050000 and all
later do not. There have been some changes in src/sys/vm but nothing else.
(I've attached the diff for convenience. It's the patch that caused the
wrong behaviour.)

Unfortunately I don't know how to debug this by myself but I'll be really
thankful for any suggestions of what to do next or other help.

Matej
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