WritePrepared Txn: optimize SubBatchCnt
Summary: Make use of the index in WriteBatchWithIndex to also count the number of sub-batches. This eliminates the need to separately scan the batch to count the number of sub-batches once a duplicate key is detected. Closes https://github.com/facebook/rocksdb/pull/3529 Differential Revision: D7049947 Pulled By: maysamyabandeh fbshipit-source-id: 81cbf12c4e662541c772c7265a8f91631e25c7cd
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