BC native tests port to Konan's TestRunner

backend.native/tests/codegen/function/defaults8.kt

@@ -1,3 +1,7 @@
+package codegen.function.defaults8
+
+import kotlin.test.*
+
 class Foo {
     fun test(x: Int = 1) = x
 }
@@ -6,6 +10,6 @@ class Bar {
     fun test(x: Int = 2) = x
 }
 
-fun main(args : Array<String>) {
+@Test fun runTest() {
     println(Bar().test())
 }