[MachineScheduler] Comments fixing.

The name/comment of the third argument to the ScheduleDAGMI constructor
is RemoveKillFlags and not IsPostRA. Only the comments are changed.

Review: A Trick

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286350 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed