BC native tests port to Konan's TestRunner

backend.native/tests/codegen/function/defaults4.kt

@@ -1,3 +1,7 @@
+package codegen.function.defaults4
+
+import kotlin.test.*
+
 open class A {
     open fun foo(x: Int = 42) = println(x)
 }
@@ -8,6 +12,6 @@ class C : B() {
     override fun foo(x: Int) = println(x + 1)
 }
 
-fun main(args: Array<String>) {
+@Test fun runTest() {
     C().foo()
 }