[CASSANDRA-21083][trunk] Optimize memtable flush logic #4536
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…location for the flushing thread
…st clustering key in a partition
…per (avoid megamorphic call + cache isCounterColumn)
… auto-boxing for logging of primitive parameters
…tes.hashCode if not needed, avoid capturing lambda allocation in UnfilteredSerializer.serializeRowBody
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…nd ShardedSkipListMemtable
src/java/org/apache/cassandra/io/sstable/metadata/MetadataCollector.java
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