[PATCH] Generate Loop Fusion Statistics

[Dave Estes]

Hi grosser, dpeixott,

This change creates statistics for loop fusion and reports them
when statistics are enabled and the schedule optimizer's fusion
strategy is set to max.

http://reviews.llvm.org/D5908

Files:
  lib/Transform/ScheduleOptimizer.cpp
  test/ScheduleOptimizer/loop-fusion-stats-01.ll
  test/ScheduleOptimizer/loop-fusion-stats-02.ll
  test/ScheduleOptimizer/loop-fusion-stats-03.ll
  test/ScheduleOptimizer/loop-fusion-stats-04.ll
  test/ScheduleOptimizer/loop-fusion-stats-05.ll
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