message: Fix accidental regression in wide-const layout test
  Summary:
  Name scope was wrong, and needed a more general add op name
  Manifest Tasks: T10908
  Test Plan: All tests ok (tested on V1 and V2 now)
  Reviewers: #tensorflow, georgep
diff: @@ -78,7 +78,7 @@ class WideConstExpansionTest(xla_test.XLATestCase):
  i = 0
  c = constant_op.constant(4, shape=shape, dtype=dtype, name="c")
  - return control_flow_ops.while_loop(cond, body, (i, c, y))[2]
  + return control_flow_ops.while_loop(cond, body, (i, c, y), name='')[2]
  with ops.device('cpu'):
  y = array_ops.placeholder(dtype, [1])
  @@ -102,7 +102,7 @@ class WideConstExpansionTest(xla_test.XLATestCase):
  ok = [
  '__seed*', 'Copy_*_to_*', 'Slice/dynamic-slice*/dynamicSlice',
  'Mean/reduce', 'Mean/multiply', 'add*/add*/AddTo',
  - 'add_1_0/fusion/Op/Add'
  + 'add_*/fusion/Op/Add'
  ]
  self.assertTrue(tu.check_all_compute_sets_and_list(cs_list, ok))
  