This patch introduces a new bug.  While it does guarantee that
the assertion in vm_object_shadow isn't tripped over, it doesn't
clear the OBJ_ONEMAPPING flag on the newly created shadow object.
(New objects are created with OBJ_ONEMAPPING set.)  Consequently,
we'll have two overlapping mappings to the same shadow object
that has OBJ_ONEMAPPING set.  That's bad.

The real problem is that the assertion is just plain wrong, not
the code around it.  It needs to be corrected or removed.


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