Bug 1025875 part 6 - Fix small bug in JSRope::flattenInternal. r=luke

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extra : rebase_source : 9973455caf6edf0e2d05e59127d0e3734e65485d
Bug 1025875 part 9 - Make eval work with Latin1 strings. r=njn

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extra : rebase_source : 83d0dc7e70db7cc559d62829d301c4fead9f3ba6
Bug 1025875 part 10 - Make array.join work with Latin1 strings. r=luke

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extra : rebase_source : e811a9ad5b5c8e46ad65554e55272fab95fef2cc