Method toStringRef

fdbserver/VersionedBTree.actor.cpp:4160–4165

	}

	StringRef toStringRef(Arena& arena) const {
		StringRef c = makeString(size(), arena);
		memcpy(mutateString(c), a.begin(), a.size());
		memcpy(mutateString(c) + a.size(), b.begin(), b.size());
		return c;
	}

	Standalone<StringRef> toStringRef() const {
		Arena a;