Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/casts/literalExpressionAsGenericArgument.kt

@@ -0,0 +1,24 @@
+// FILE: Box.java
+
+public class Box<T> {
+    private final T value;
+
+    public Box(T value) {
+        this.value = value;
+    }
+
+    public static <T> Box<T> create(T defaultValue) {
+        return new Box(defaultValue);
+    }
+
+    public T getValue() {
+        return value;
+    }
+}
+
+// FILE: test.kt
+
+fun box(): String {
+    val sub = Box<Long>(-1)
+    return if (sub.value == -1L) "OK" else "fail"
+}