Immutable data prototype. (#799)

backend.native/tests/runtime/collections/array3.kt

@@ -0,0 +1,13 @@
+import konan.*
+
+fun main(args : Array<String>) {
+    val data = immutableBinaryBlobOf(0x1, 0x2, 0x3, 0x7, 0x8, 0x9, 0x80, 0xff)
+    for (b in data) {
+        print("$b ")
+    }
+    println()
+
+    val dataClone = data.toByteArray()
+    dataClone.map { print("$it ") }
+    println()
+}