Avoid to get manifest file size when recovering from it. (#6369)
Summary: Right now RocksDB gets manifest file size before recovering from it. The information is available in LogReader. Use it instead to prevent one file system call. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6369 Test Plan: Run all existing tests Differential Revision: D19714872 fbshipit-source-id: 0144be324d403c99e3da875ea2feccc8f64e883d
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