Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/inline.kt

@@ -0,0 +1,27 @@
+// FILE: Test.java
+
+public class Test {
+
+    protected String data = "O";
+
+    protected Test() {
+
+    }
+
+    protected static String testStatic() {
+        return "K";
+    }
+
+}
+
+// FILE: test.kt
+
+public inline fun test(): String {
+    val p = object : Test() {}
+    return p.data + Test.testStatic();
+}
+
+
+fun box(): String {
+    return test()
+}