[CF] Delete SuperVersion in a special function
Summary: Added a function DeleteSuperVersion that can be called in DBImpl destructor before PurgingObsoleteFiles. That way, PurgeObsoleteFiles will be able to delete all files held by alive super versions. Test Plan: column_family_test with valgrind Reviewers: dhruba, haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D16545
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