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/objects/anonymousObjectPropertyInitialization.kt

@@ -0,0 +1,14 @@
+interface T {
+    fun foo(): String
+}
+
+val o = object : T {
+    val a = "OK"
+    val f = {
+        a
+    }()
+
+    override fun foo() = f
+}
+
+fun box() = o.foo()