[ARM] Use CHECK-NEXT in CodeGen/ARM/O3-pipeline.ll. NFC.
[ARM] Use CHECK-NEXT in CodeGen/ARM/O3-pipeline.ll. NFC.

Use CHECK-NEXT, like in other pipeline tests, so that we actually
notice when the pipeline is changed.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@361810 91177308-0d34-0410-b5e6-96231b3b80d8

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