vm_object: Augment an assertion in vm_object_split()
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Authored by markj on Mon, Aug 10, 5:47 PM.

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rG12857d8f4269: vm_object: Augment an assertion in vm_object_split()

Summary

In some private discussion it was pointed out that vm_object_split()'s
pattern of dropping the source object lock looks dangerous in that the
initial assumption that OBJ_ONEMAPPING is set may become false. In
practice I believe that the map lock holds this flag stable, but let's
assert that.