Allow AthMpEvtLoopMgr to call ConcurrencyFlags::setNumProcs()
Allow AthMpEvtLoopMgr to call ConcurrencyFlags::setNumProcs()
cherry-pick from master !467 (merged)
Allow AthMpEvtLoopMgr to call ConcurrencyFlags::setNumProcs()
cherry-pick from master !467 (merged)