This large chunk of load calculation code can be easily divorced
from the main core.c scheduler file, with only a couple
prototypes and externs added to a kernel/sched header.

Some recent commits expanded the code and the documentation of
it, making it large enough to warrant separation.  For example,
see:

  556061b0, "sched/nohz: Fix rq->cpu_load[] calculations"
  5aaa0b7a, "sched/nohz: Fix rq->cpu_load calculations some more"
  5167e8d5, "sched/nohz: Rewrite and fix load-avg computation -- again"

More importantly, it helps reduce the size of the main
sched/core.c by yet another significant amount (~600 lines).
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1366398650-31599-2-git-send-email-paul.gortmaker@windriver.comSigned-off-by: NIngo Molnar <mingo@kernel.org>