pin L0 filters/indexes for compaction outputs
Summary: We need to tell the iterator the compaction output file's level so it can apply proper optimizations, like pinning filter and index blocks when user enables `pin_l0_filter_and_index_blocks_in_cache` and the output file's level is zero. Closes https://github.com/facebook/rocksdb/pull/2949 Differential Revision: D5945597 Pulled By: ajkr fbshipit-source-id: 2389decf9026ffaa32d45801a77d002529f64a62
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