Improve LRU performance #481
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1. ``` class Pair``` replaced with ```struct Pair``` 2. `ValueRef` used instead of `Value` in the `LinkedListNode`. The performance gain is up to 5% (on small numbers no gain or a minor loss), memory gain is up to 23%.
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class Pairreplaced withstruct PairValueRefused instead ofValueinLinkedListNode. The performance gain is up to 5% (on small numbers no gain or a minor loss), memory gain is up to 23%.