Method fire

flow/include/flow/ThreadHelper.actor.h:211–226

	bool canFire(int notMadeActive) const override { return true; }

	void fire(const Void& value, int& loopDepth) override {
		if (callbacks.size() > 10000)
			TraceEvent(SevWarn, "LargeMultiCallback").detail("CallbacksSize", callbacks.size());

		UNSTOPPABLE_ASSERT(loopDepth == 0);

		while (callbacks.size()) {
			auto cb = callbacks.back();
			callbacks.pop_back();
			cb->destroyHolder(cb->getHolder(this));
			if (cb->canFire(0)) {
				int ld = 0;
				cb->fire(value, ld);
			}
		}
	}

	void error(const Error& err, int& loopDepth) override {
		if (callbacks.size() > 10000)