[Test] Merge box against java testdata into codegen black box testsdata

compiler/testData/codegen/sam/kt11519.kt

@@ -0,0 +1,44 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// IGNORE_BACKEND_FIR: JVM_IR
+// SKIP_JDK6
+// MODULE: lib
+// FILE: Custom.java
+
+class Custom<K, V> {
+    private K k;
+
+    private V v;
+
+    public Custom(K k, V v) {
+        this.k = k;
+        this.v = v;
+    }
+
+    public interface MBiConsumer<T, U> {
+        void accept(T t, U u);
+    }
+
+    public void forEach(MBiConsumer<? super K, ? super V> action) {
+        action.accept(k, v);
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+import java.util.Arrays
+
+fun box(): String {
+    val instance = Custom<String, String>("O", "K")
+    var result = "fail"
+    instance.forEach { a, b ->
+        result = a + b
+    }
+
+    val superInterfaces = Arrays.toString((Class.forName("_1Kt\$box$1")).genericInterfaces)
+    if (superInterfaces != "[Custom\$MBiConsumer<java.lang.String, java.lang.String>]") {
+        return "fail: $superInterfaces"
+    }
+
+    return result
+}