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Draft: Switch the default liburcu flavor to QSBR

Ondřej Surý requested to merge 4102-use-liburcu-qsbr-flavor-by-default into main

Now that Userspace-RCU is TSAN-aware, we can safely switch to QSBR flavor of liburcu which is much faster than the default membarrier flavor, but requires the loops rcu_quiescent_state() to be called periodically from the libuv prepare handler.

Closes #4102

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