Add experimental_allow_mempurge flag to benchmark. (#8546)
Summary: Tiny PR to add the `experimental_allow_mempurge` to the `db_bench` tool (`Mempurge` is the current prototype for memtable garbage collection). This is useful to benchmark the prototype of this new feature, stress test it and help find new meaningful heuristics for GC. By default, the flag to allow `mempurge` is set to `false`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8546 Reviewed By: anand1976 Differential Revision: D29738338 Pulled By: bjlemaire fbshipit-source-id: 01892883a2f1c714c110718674da05992d6e2dd6
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