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/closures/captureOuterProperty/inFunction.kt

@@ -0,0 +1,13 @@
+interface T {
+    fun result(): String
+}
+
+class A(val x: String) {
+    fun foo() = object : T {
+        fun bar() = x
+
+        override fun result() = bar()
+    }
+}
+
+fun box() = A("OK").foo().result()