Siying Dong 72c8533f2c DBIter to use IteratorWrapper for inner iterator (#5214)
Summary:
It's hard to get DBIter to directly use InternalIterator::NextAndGetResult() because the code change would be complicated. Instead, use IteratorWrapper, where Next() is already using NextAndGetResult(). Performance number is hard to measure because it is small and ther is variation. I run readseq many times, and there seems to be 1% gain.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5214

Differential Revision: D15003635

Pulled By: siying

fbshipit-source-id: 17af1965c409c2fe90cd85037fbd2c5a1364f82a
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