message: Remove unused function.
  Avoids:
  tensorflow/c/eager/c_api.cc:93:6: warning: 'bool {anonymous}::IsXLA(const tensorflow::Device*)' defined but not used [-Wunused-function]
diff: @@ -90,12 +90,6 @@ bool IsCPU(const tensorflow::Device* d) {
  return d == nullptr || d->tensorflow_gpu_device_info() == nullptr;
  }
  -bool IsXLA(const tensorflow::Device* d) {
  - if (d == nullptr) return false;
  - const auto& device_type = d->attributes().device_type();
  - return device_type.find("XLA") != std::string::npos;
  -}
  -
  string DeviceName(const tensorflow::Device* d) {
  return (d == nullptr) ? "cpu:0" : d->name();
  }
  