message: Fix read_variable_op GPU test
diff: @@ -425,7 +425,7 @@ class MicroBenchmarks(test.Benchmark):
  if not context.num_gpus():
  return
  with context.device(GPU):
  - m = resource_variable_ops.ResourceVariable(self._m_2_by_2)
  + m = resource_variable_ops.ResourceVariable(self._m_2_by_2.gpu())
  self._benchmark_read_variable(m, num_iters=self._num_iters_2_by_2)
  def benchmark_read_variable_op_with_tape_2_by_2_CPU(self):
  @@ -438,7 +438,7 @@ class MicroBenchmarks(test.Benchmark):
  if not context.num_gpus():
  return
  with context.device(GPU):
  - m = resource_variable_ops.ResourceVariable(self._m_2_by_2)
  + m = resource_variable_ops.ResourceVariable(self._m_2_by_2.gpu())
  self._benchmark_read_variable_with_tape(
  m, num_iters=self._num_iters_2_by_2)
  