using OpSideEffectMap = std::unordered_map<Operation*, SideEffectsByResourceId>;

// Update `side_effects_by_resource_id` with `side_effects`.
void UpdateSideEffectsByResourceId(
    const SideEffects& side_effects,
    SideEffectsByResourceId& side_effects_by_resource_id) {
  ResourceId id = side_effects.GetResourceId();
  auto iter = side_effects_by_resource_id.find(id);