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/builtinStubMethods/MapEntryWithSetValue.kt

@@ -0,0 +1,17 @@
+// TODO: muted automatically, investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+class MyMapEntry<K, V>: Map.Entry<K, V> {
+    override fun hashCode(): Int = 0
+    override fun equals(other: Any?): Boolean = false
+    override val key: K get() = throw UnsupportedOperationException()
+    override val value: V get() = throw UnsupportedOperationException()
+
+    public fun setValue(value: V): V = value
+}
+
+fun box(): String {
+    (MyMapEntry<String, Int>() as java.util.Map.Entry<String, Int>).setValue(1)
+
+    return "OK"
+}