Prevent file prefetch when mmap is enabled. (#6206)
Summary: Right now, sometimes file prefetching is still on when mmap is enabled. This causes bug of reading wrong data. In this commit, we remove all those possible paths. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6206 Test Plan: make crash_test with compaction_readahead_size, which used to fail. RUn all existing tests. Differential Revision: D19149429 fbshipit-source-id: 9e18ea8c566e416aac9647bdd05afe596634791b
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