fix for 1345

compiler/testData/codegen/regressions/kt1345.kt

@@ -0,0 +1,13 @@
+trait Creator<T> {
+    fun create() : T
+}
+
+class Actor(val code: String = "OK")
+
+trait Factory : Creator<Actor>
+
+class MyFactory() : Factory {
+    override fun create(): Actor = Actor()
+}
+
+fun box() : String = MyFactory().create().code