Fix use of make_unique in Arena::AllocateNewBlock (#11012)
Summary: The change to `make_unique<char[]>` in https://github.com/facebook/rocksdb/issues/10810 inadvertently started initializing data in Arena blocks, which could lead to increased memory use due to (at least on our implementation) force-mapping pages as a result. This change goes back to `new char[]` while keeping all the other good parts of https://github.com/facebook/rocksdb/issues/10810. Pull Request resolved: https://github.com/facebook/rocksdb/pull/11012 Test Plan: unit test added (fails on Linux before fix) Reviewed By: anand1976 Differential Revision: D41658893 Pulled By: pdillinger fbshipit-source-id: 267b7dccfadaeeb1be767d43c602a6abb0e71cd0
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