Added CPU prefetch for skiplist
Summary: This change causes following changes result of test: ./db_bench --writes 10000000 --benchmarks="fillrandom" --compression_type none from fillrandom : 3.177 micros/op 314804 ops/sec; 34.8 MB/s to fillrandom : 2.777 micros/op 360087 ops/sec; 39.8 MB/s Closes https://github.com/facebook/rocksdb/pull/2961 Differential Revision: D5977822 Pulled By: yiwu-arbug fbshipit-source-id: 1ea77707bffa978b1592b0c5d0fe76bfa1930f8d
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