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/javaInterop/objectMethods/cloneCallsConstructor.kt

@@ -0,0 +1,14 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+data class A(var x: Int) : Cloneable {
+    public override fun clone(): A = A(x)
+}
+
+fun box(): String {
+    val a = A(42)
+    val b = a.clone()
+    if (b != a) return "Fail equals"
+    if (b === a) return "Fail identity"
+    return "OK"
+}

backend.native/tests/external/codegen/blackbox/javaInterop/objectMethods/cloneCallsSuper.kt

@@ -0,0 +1,14 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+data class A(var x: Int) : Cloneable {
+    public override fun clone(): A = super.clone() as A
+}
+
+fun box(): String {
+    val a = A(42)
+    val b = a.clone()
+    if (a != b) return "Fail equals"
+    if (a === b) return "Fail identity"
+    return "OK"
+}

backend.native/tests/external/codegen/blackbox/javaInterop/objectMethods/cloneCallsSuperAndModifies.kt

@@ -0,0 +1,19 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+data class A(var x: Int) : Cloneable {
+    public override fun clone(): A {
+        val result = super.clone() as A
+        result.x = 239
+        return result
+    }
+}
+
+fun box(): String {
+    val a = A(42)
+    val b = a.clone()
+    if (a == b) return "Fail: $a == $b"
+    if (a === b) return "Fail: $a === $b"
+    if (b.x != 239) return "Fail: b.x = ${b.x}"
+    return "OK"
+}

backend.native/tests/external/codegen/blackbox/javaInterop/objectMethods/cloneHashSet.kt

@@ -0,0 +1,12 @@
+// TARGET_BACKEND: JVM
+
+fun box(): String {
+    val a = HashSet<String>()
+    a.add("live")
+    a.add("long")
+    a.add("prosper")
+    val b = a.clone()
+    if (a != b) return "Fail equals"
+    if (a === b) return "Fail identity"
+    return "OK"
+}

backend.native/tests/external/codegen/blackbox/javaInterop/objectMethods/cloneHierarchy.kt

@@ -0,0 +1,32 @@
+// TARGET_BACKEND: JVM
+
+open class A : Cloneable {
+    public override fun clone(): A = super.clone() as A
+}
+
+open class B(var s: String) : A() {
+    override fun clone(): B = super.clone() as B
+}
+
+open class C(s: String, var l: ArrayList<Any>): B(s) {
+    override fun clone(): C {
+        val result = super.clone() as C
+        result.l = l.clone() as ArrayList<Any>
+        return result
+    }
+}
+
+fun box(): String {
+    val l = ArrayList<Any>()
+    l.add(true)
+
+    val c = C("OK", l)
+    val d = c.clone()
+
+    if (c.s != d.s) return "Fail s: ${d.s}"
+    if (c.l != d.l) return "Fail l: ${d.l}"
+    if (c.l === d.l) return "Fail list identity"
+    if (c === d) return "Fail identity"
+
+    return "OK"
+}

backend.native/tests/external/codegen/blackbox/javaInterop/objectMethods/cloneableClassWithoutClone.kt

@@ -0,0 +1,14 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+data class A(val s: String) : Cloneable {
+    fun externalClone(): A = clone() as A
+}
+
+fun box(): String {
+    val a = A("OK")
+    val b = a.externalClone()
+    if (a != b) return "Fail equals"
+    if (a === b) return "Fail identity"
+    return b.s
+}