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MDEV-22203: WSREP_ON is unnecessarily expensive to evaluate
This is a backport of the applicable part of commit 93475af and commit 2c39f69 from 10.4. Before 10.4 and Galera 4, WSREP_ON is a macro that points to a global Boolean variable, so it is not that expensive to evaluate, but we will add an unlikely() hint around it. WSREP_ON_NEW: Remove. This macro was introduced in commit c863159 when reverting WSREP_ON to its previous definition. We replace some use of WSREP_ON with WSREP(thd), like it was done in 93475af. Note: the macro WSREP() in 10.1 is equivalent to WSREP_NNULL() in 10.4. Item_func_rand::seed_random(): Avoid invoking current_thd when WSREP is not enabled.
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