Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/java8/box/defaultMethodCallFromInterface.kt

@@ -0,0 +1,28 @@
+// FILE: Simple.java
+
+public interface Simple {
+    default String test(String s) {
+        return s + "K";
+    }
+
+    static String testStatic(String s) {
+        return s + "K";
+    }
+}
+
+// FILE: main.kt
+
+interface KInterface : Simple {
+    fun bar(): String {
+        return test("O") + Simple.testStatic("O")
+    }
+}
+
+class Test : KInterface {}
+
+fun box(): String {
+    val test = Test().bar()
+    if (test != "OKOK") return "fail $test"
+
+    return "OK"
+}