[SystemZ]  NFC: Remove redundant check in SystemZHazardRecognizer.
[SystemZ]  NFC: Remove redundant check in SystemZHazardRecognizer.

Remove the redundant check against zero when updating ProcResourceCounters in
nextGroup(), as pointed out in https://reviews.llvm.org/D50187.

Review: Ulrich Weigand.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@339139 91177308-0d34-0410-b5e6-96231b3b80d8

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