- Make a UVM_OBJ_IS_DEVICE macro.

 - Use it to skip device mappings while dumping core.
 - Ignore EFAULT errors while dumping core since they can happen
   even for valid mappings. Just skip that part of the core file and
   let it get automagically zero-filled.

This fixes the broken X core dumps that people have been seeing and also
fixes some other potential problems that could prevent core dumps (mmaps
beyond EOF, etc.).

tedu@ ok

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