[lua] Printing of recursive values causes stack overflow

[Simn]

From #7901:

class Main {
	var ref:Main;

	public function new() {}

	static public function main() {
		var m = new Main();
		m.ref = m;
		trace(Std.string(m));
	}
}

[Simn]

Would be good to fix this for 4.0.

[jdonaldson]

I looked at it and came up with the same fix as @RealyUniqueName. Any reason not to push that one Alex?

[RealyUniqueName]

It's already in #8113. Just waiting other targets to be fixed.

[jdonaldson]

Great, I'll close this one then.

[Simn]

Oh sorry, #8113 didn't mention lua.