KT-1535 test for obsolete issue

compiler/testData/codegen/regressions/kt1535.kt

@@ -0,0 +1,18 @@
+class Works() : jet.Function0<Object>() {
+    public override fun invoke():Object {
+      return "Works" as Object
+    }
+}
+class Broken() : jet.Function0<String>() {
+    public override fun invoke():String {
+      return "Broken"
+    }
+}
+
+fun main(args: Array<String>) {
+  val works1: ()->Object = Works();
+  works1()
+
+  val broken1: ()->String = Broken();
+  broken1()
+}