Fixed the tsan failure in util/compaction_job_stats_impl.cc
Summary: The type of smallest_output_key_prefix and largest_output_key_prefix have been changed to std::string in https://reviews.facebook.net/D39537. As a result, we shouldn't do smallest_output_key_prefix[0] = 0 in the initialization. Test Plan: compile db_test with tsan enabled and repeat DBTest.CompactionDeletionTrigger test to verify the tsan issue has been gone. Reviewers: igor, sdong Reviewed By: sdong Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D39645
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