backend/tests: Add blackbox tests from Kotlin JVM

Added tests from testData/codegen/box directory. There are blackbox tests
in other directories and they are to be added.

backend.native/tests/external/codegen/blackbox/jdk/hashMap.kt

@@ -0,0 +1,14 @@
+
+fun box(): String {
+    val map: MutableMap<String, Int> = HashMap<String, Int>()
+    map.put("a", 1)
+    map.put("bb", 2)
+    map.put("ccc", 3)
+    map.put("dddd", 4)
+    if (map.get("a") != 1) return "fail 1"
+    if (map.size != 4) return "fail 2"
+    if (map.get("eeeee") != null) return "fail 3"
+    if (!map.containsKey("bb")) return "fail 4"
+    if (map.keys.contains("ffffff")) return "fail 5"
+    return "OK"
+}