JiYou 82e8e9e26b VersionBuilder: optmize SaveTo() to linear time. (#4366)
Summary:
Because `base_files` and `added_files` both are sorted, using a merge
operation to these two sorted arrays is more effective. The complexity
is reduced to linear time.

    - optmize the merge complexity.
    - move the `NDEBUG` of sorted `added_files` out of merge process.

Signed-off-by: JiYou <jiyou09@gmail.com>
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4366

Differential Revision: D9833592

Pulled By: ajkr

fbshipit-source-id: dd32b67ebdca4c20e5e9546ab8082cecefe99fd0
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