Cleaned up and simplified LRU cache implementation (#5579)
Summary: The 'refs' field in LRUHandle now counts only external references, since anyway we already have the IN_CACHE flag. This simplifies reference accounting logic a bit. Also cleaned up few asserts code as well as the comments - to be more readable. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5579 Differential Revision: D16286747 Pulled By: elipoz fbshipit-source-id: 7186d88f80f512ce584d0a303437494b5cbefd7f
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