Analyzer infinite loop with recursive enum values

[Simn]

This currently hangs the analyzer:

class Main {
	static function main() {
		blowUp([]);
	}

	public static function blowUp(arr:Array<Foo>) {
		var qp = FooRec(arr.pop());
		while (arr.length > 0) {
			qp = FooRec(qp);
		}
	}
}

enum Foo {
	FooRec(foo:Foo);
}

It would be better if it didn't do that. The cause is ConstPropagation's equals recursively checking the arguments of enum values, which seems dubious anyway.