tests: Add test for sticking ES3 classes in a `Vector.<Object>`

tests/tests/swfs/avm2/vector_es3class_coercion/Test.as

@@ -0,0 +1,32 @@
+package {
+	public class Test {
+	}
+}
+
+function Superclass() {
+	
+}
+
+function Subclass() {
+	
+}
+
+Subclass.prototype = new Superclass();
+
+trace("/// var a: Vector.<Object> = new <Object>[];");
+var a:Vector.<Object> = new <Object>[];
+
+trace("/// a.length = 2;");
+a.length = 2;
+
+trace(a[0]);
+trace(a[1]);
+
+trace("/// a[0] = new Superclass();");
+a[0] = new Superclass();
+
+trace("/// a[1] = new Subclass();");
+a[1] = new Subclass();
+
+trace(a[0]);
+trace(a[1]);

tests/tests/swfs/avm2/vector_es3class_coercion/output.txt

@@ -0,0 +1,8 @@
+/// var a: Vector.<Object> = new <Object>[];
+/// a.length = 2;
+null
+null
+/// a[0] = new Superclass();
+/// a[1] = new Subclass();
+[object Object]
+[object Object]