Add a PerfContext counter for merge operands applied in point lookups (#11284)
Summary: The existing PerfContext counter `internal_merge_count` only tracks the Merge operands applied during range scans. The patch adds a new counter called `internal_merge_count_point_lookups` to track the same metric for point lookups (`Get` / `MultiGet` / `GetEntity` / `MultiGetEntity`), and also fixes a couple of cases in the iterator where the existing counter wasn't updated. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11284 Test Plan: `make check` Reviewed By: jowlyzhang Differential Revision: D43926082 Pulled By: ltamasi fbshipit-source-id: 321566d8b4cf0a3b6c9b73b7a5c984fb9bb492e9
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