[js] Enums don't survive advanced minification

[RealyUniqueName]

enum Dummy {
	EDummy(s:String);
}

class Main {
	static function main() {
		var a = EDummy('foo');
		trace(Type.enumParameters(a));
	}
}

Actual result:

$ haxe -m Main -L closure -D closure_advanced --js test.js && node test.min.js
src/Main.hx:8: [ undefined ]

Expected result:

$ haxe -m Main -L closure -D closure_advanced --js test.js && node test.min.js
src/Main.hx:8: [ 'foo' ]

PR is on the way.

[RealyUniqueName]

Related issue: #9345