Andrew Kryczka a34b2e388e Fix caching of compaction picker's next index
Summary:
The previous implementation of caching `file_size` index made no sense. It only remembered the original span of locked files starting from beginning of `file_size`. We should remember the index after all compactions that have been considered but rejected. This will reduce the work we do while holding the db mutex.
Closes https://github.com/facebook/rocksdb/pull/2624

Differential Revision: D5468152

Pulled By: ajkr

fbshipit-source-id: ab92a4bffe76f9f174d861bb5812b974d1013400
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