Avoid allocating murmur3.Hash too frequently
Avoid allocating murmur3.Hash too frequently

These hashes were getting allocate very frequently with high cardinality
datasets.  This allows them to be re-used.

li-ang/influxdb,linearb/influxdb,mark-rushakoff/influxdb,mark-rushakoff/influxdb,vladlopes/influxdb,benbjohnson/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,benbjohnson/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,influxdb/influxdb,linearb/influxdb,influxdb/influxdb,influxdata/influxdb,li-ang/influxdb,influxdb/influxdb,linearb/influxdb,benbjohnson/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,linearb/influxdb,vladlopes/influxdb,vladlopes/influxdb,nooproblem/influxdb,nooproblem/influxdb,benbjohnson/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,influxdata/influxdb,influxdb/influxdb,influxdb/influxdb,vladlopes/influxdb,linearb/influxdb