Oops, fix the double faults people were seeing with the recent changes to

witness.  Sleepable locks such as sx locks always come before all mutexes
including Giant.  However, the static lock order list placed Giant before
the proctree and allproc sx locks.  This resulted in witness creating a
cycle in its lock order "tree" (real trees don't have cycles) leading to
infinite recursion and eventually a double fault.  To fix, put Giant after
sx locks in the lock order list.

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