Mammo, Mulugeta 1861de455e Add arena_block_size flag to db_bench (#7654)
Summary:
db_bench currently does not allow overriding the default `arena_block_size `calculation ([memtable size/8](https://github.com/facebook/rocksdb/blob/master/db/column_family.cc#L216)). For memtables whose size is in gigabytes, the `arena_block_size` defaults to hundreds of megabytes (affecting performance).

Exposing this option in db_bench would allow us to test the workloads with various `arena_block_size` values.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7654

Reviewed By: jay-zhuang

Differential Revision: D24996812

Pulled By: ajkr

fbshipit-source-id: a5e3d2c83d9f89e1bb8382f2e8dd476c79e33bef
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