[-stable 4.1] sched/fair: Beef up wake_wide()

Hello,

I've tracked down a performance regression on 4.1 to select_task_rq_fair()
CPU affinity heuristics, and the patch in question addressed it:

  commit 63b0e9edceec10fa41ec33393a1515a5ff444277
  Author: Mike Galbraith <umgwanakikbuti at gmail.com>

    sched/fair: Beef up wake_wide()

	-ss