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Fix Array cloning in RenameTypes transform.

https://github.com/apollographql/graphql-tools/pull/756#discussion_r186534662

The iteration order of Object.keys(value).forEach was never the problem.
The problem is that Object.create(Object.getPrototypeOf(array)) does not
produce a new value that passes the Array.isArray test.

cc @freiksenet @antiqe

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