Moving sequence number compaction variables from SubCompactionState to CompactionJob
Summary: It was pointed out to me that the members of SubCompactionState 'earliest_snapshot', 'latest_snapshot' and 'visible_at_tip' are never modified by the subcompactions, so they can stay as global varaibles instead to make things simpler. Test Plan: make all && make check Reviewers: sdong, igor, noetzli, anthony, yhchiang Reviewed By: yhchiang Subscribers: dhruba Differential Revision: https://reviews.facebook.net/D45477
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