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/delegatedProperty/delegateByTopLevelFun.kt

@@ -0,0 +1,21 @@
+import kotlin.reflect.KProperty
+
+class Delegate {
+    var inner = 1
+    operator fun getValue(t: Any?, p: KProperty<*>): Int = inner
+    operator fun setValue(t: Any?, p: KProperty<*>, i: Int) { inner = i }
+}
+
+fun foo() = Delegate()
+
+class A {
+    var prop: Int by foo()
+}
+
+fun box(): String {
+  val c = A()
+  if(c.prop != 1) return "fail get"
+  c.prop = 2
+  if (c.prop != 2) return "fail set"
+  return "OK"
+}