[Test] Move KotlinAgainstKotlin tests under BlackBoxCodegen tests

compiler/testData/codegen/box/compileKotlinAgainstKotlin/fir/AnonymousObjectInProperty.kt

@@ -0,0 +1,20 @@
+// TARGET_BACKEND: JVM
+// MODULE: lib
+// FILE: A.kt
+
+abstract class A {
+    private val x = object {
+        fun foo() = "OK"
+    }
+
+    protected val y = x.foo()
+}
+
+// MODULE: main(lib)
+// FILE: B.kt
+
+class B : A() {
+    val z = y
+}
+
+fun box() = B().z