kib 3677635c7b Call pmap_copy() only for map entries which have the backing object
instantiated.

Calling pmap_copy() on non-faulted anonymous memory entries is useless.

Noted and reviewed by:	alc
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2017-06-21 18:54:28 +00:00
..
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