MFC r308174, r308261

  Move and revise a comment about the relation between the object's paging-
  in-progress count and the vnode.  Prior to r188331, we always acquired
  the vnode lock before incrementing the object's paging-in-progress count.
  Now, we increment it before attempting to acquire the vnode lock with
  LK_NOWAIT, but we never sleep acquiring the vnode lock while we have the
  count incremented.

  In vm_fault()'s loop over the shadow chain, move a comment describing our
  invariants to a better place.  Also, add two comments concerning the
  relationship between the map and vnode locks.

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