mpm_event: remove atomics for timeout_queue's total counter.
It's always updated under the timeout_mutex lock, or read for logging and scoreboard updates (not critical). For the read cases a volatile access is enough, while removing the atomic ops for the already protected write cases saves cycles and context switches. git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1819853 13f79535-47bb-0310-9956-ffa450edef68
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