Improve object arrays support. (#182)

Also fix the way how symbol names are being generated. Before arrays2.kt was not linking.

backend.native/tests/runtime/collections/array0.kt

@@ -24,6 +24,6 @@ fun main(args : Array<String>) {
     val booleanArray = BooleanArray(12)
     println(booleanArray.size.toString())
 
-    val stringArray = Array<String>(13)
+    val stringArray = Array<String>(13, { i -> ""})
     println(stringArray.size.toString())
 }