Jemalloc: Avoid blocking on background thread lock for stats.
Background threads may run for a long time, especially when the # of dirty pages is high. Avoid blocking stats calls because of this (which may cause latency spikes). see https://github.com/jemalloc/jemalloc/issues/1502 cherry picked from commit 1a71533511027dbe3f9d989659efeec446915d6b
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