Added tests

backend.native/tests/codegen/enum/valueOf.kt

@@ -8,4 +8,7 @@ fun main(args: Array<String>) {
     println(E.valueOf("E1").toString())
     println(E.valueOf("E2").toString())
     println(E.valueOf("E3").toString())
+    println(enumValueOf<E>("E1").toString())
+    println(enumValueOf<E>("E2").toString())
+    println(enumValueOf<E>("E3").toString())
 }

backend.native/tests/codegen/enum/values.kt

@@ -8,4 +8,7 @@ fun main(args: Array<String>) {
     println(E.values()[0].toString())
     println(E.values()[1].toString())
     println(E.values()[2].toString())
+    println(enumValues<E>()[0].toString())
+    println(enumValues<E>()[1].toString())
+    println(enumValues<E>()[2].toString())
 }