[TargetSchedule] Use 'isOutOfOrder' as possible to avoid magic number. NFC.
[TargetSchedule] Use 'isOutOfOrder' as possible to avoid magic number. NFC.

Summary:
Using isOutOfOrder makes the code more clear.

Reviewers: rengolin, atrick, hfinkel.

Differential Revision: http://reviews.llvm.org/D21548


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@273255 91177308-0d34-0410-b5e6-96231b3b80d8

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