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())
 }

backend.native/tests/runtime/collections/array2.kt

@@ -0,0 +1,7 @@
+fun main(args : Array<String>) {
+    val byteArray = Array<Byte>(5, { i -> (i * 2).toByte() })
+    byteArray.map { println(it) }
+
+    val intArray = Array<Int>(5, { i -> i * 4 })
+    println(intArray.sum())
+}

backend.native/tests/runtime/collections/moderately_large_array1.kt

@@ -0,0 +1,11 @@
+fun main(args: Array<String>) {
+    val a = Array<Byte>(100000, { i -> i.toByte()})
+
+    var sum = 0
+    for (b in a) {
+        sum += b
+    }
+
+    println(sum)
+}
+