message: Fix CS names.
  Summary:
  tf2.4 only
  Ref T42747
  Reviewers: #tensorflow, simonl, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, georgep
  Maniphest Tasks: T42747
diff: @@ -1038,8 +1038,8 @@ class IpuFuseOpsTest(xla_test.XLATestCase):
  'gradients/vs/absolute_difference/Abs_grad/Sign',
  'gradients/vs/absolute_difference/Abs_grad/mul/fusion',
  '/negate/Op/Negate',
  - 'gradients/vs/Reshape_grad/Reshape/tensor/multi-update-add*/multiUpdateAdd',
  - 'gradients/vs/Reshape_grad/Reshape/tensor/multi-update-add*/multiUpdateAdd/*/Fill',
  + 'gradients/vs/Reshape_grad/UnsortedSegmentSum/multi-update-add*/multiUpdateAdd',
  + 'gradients/vs/Reshape_grad/UnsortedSegmentSum/multi-update-add*/multiUpdateAdd/*/Fill',
  'vs/embedding_lookup*/multi-slice',
  'vs/absolute_difference/Sub/subtract.*/Subtract',
  'vs/absolute_difference/Abs/abs.*/Op/Absolute',
  