olly 6362dfeb98 Replace LinkedBlockingDeque with our own linked list
This will allow us to maintain a reference to the middle
of the queue, which is necessary to efficiently support
decoupling the read position from the start of the buffer.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=158839336
2017-06-14 19:30:21 +01:00
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