message: Support scoped_allocator_ops for renamed device.
  This fixes
diff: @@ -58,6 +58,15 @@ class RenamedDevice : public Device {
  return underlying_->GetAllocator(attr);
  }
  + Allocator* GetScopedAllocator(AllocatorAttributes attr,
  + int64 step_id) override {
  + return underlying_->GetScopedAllocator(attr, step_id);
  + }
  +
  + ScopedAllocatorMgr* GetScopedAllocatorMgr() const override {
  + return underlying_->GetScopedAllocatorMgr();
  + }
  +
  const Eigen::ThreadPoolDevice* eigen_cpu_device() override {
  return underlying_->eigen_cpu_device();
  }
  