Make kldunload cbb work:

o Implement the thread killing interlock as described by jhb in arch@
  while talking to markm.
o Hold Giant around cbb_insert()/cbb_remove().  Deep in the belly of
  the vm code we panic if we don't hold this when we activate the memory
  for reading the CIS.
o If we had to do the kludge alloc, then do a kludge free.

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