support Prev() in prefix seek mode
Summary: As title, make sure Prev() works as expected with Next() when the current iter->key() in the range of the same prefix in prefix seek mode Test Plan: make all check -j64 (add prefix_test with PrefixSeekModePrev test case) Reviewers: andrewkr, sdong, IslamAbdelRahman Reviewed By: IslamAbdelRahman Subscribers: yoshinorim, andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D61419
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