Add overrides by name. (#54)

backend.native/tests/build.gradle

@@ -188,11 +188,10 @@ task hello2(type: RunKonanTest) {
     source = "runtime/basic/hello2.kt"
 }
 
-/* TODO: enable, once can call toString() on Int.
 task hello3(type: RunKonanTest) {
-    goldValue = "239"
+    goldValue = "239\ntrue\n3.14159\nA\n"
     source = "runtime/basic/hello3.kt"
-} */
+}
 
 task tostring0(type: RunKonanTest) {
     goldValue = "127\n255\n239\nA\n1122334455\n112233445566778899\n1E+27\n1E-300\ntrue\nfalse\n"

backend.native/tests/runtime/basic/hello3.kt

@@ -1,3 +1,7 @@
 fun main(args : Array<String>) {
-    print(239)
+    println(239)
+    // TODO: enable, once override by name is implemented.
+    println(true)
+    println(3.14159)
+    println('A')
 }