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/functions/dataLocalVariable.kt

@@ -0,0 +1,8 @@
+// TODO: Enable when JS backend gets support of Java class library
+// IGNORE_BACKEND: JS
+fun ok(b: Boolean) = if (b) "OK" else "Fail"
+
+fun box(): String {
+    val data = java.util.Arrays.asList("foo", "bar")!!
+    return ok(data.contains("foo"))
+}