Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/collections/irrelevantSizeOverrideInJava.kt

@@ -0,0 +1,44 @@
+// FILE: J.java
+
+import java.util.*;
+
+public class J implements Sized {
+    final public int getSize() { return 123; }
+}
+
+// FILE: test.kt
+
+interface Sized {
+    val size: Int
+}
+
+class A<T> : J(), Collection<T> {
+    override fun isEmpty(): Boolean {
+        throw UnsupportedOperationException()
+    }
+
+    override fun contains(element: T): Boolean {
+        throw UnsupportedOperationException()
+    }
+
+    override fun iterator(): Iterator<T> {
+        throw UnsupportedOperationException()
+    }
+
+    override fun containsAll(elements: Collection<T>): Boolean {
+        throw UnsupportedOperationException()
+    }
+}
+
+fun box(): String {
+    val a = A<String>()
+    if (a.size != 123) return "fail 1"
+
+    val c: Collection<String> = a
+    if (c.size != 123) return "fail 2"
+
+    val sized: Sized = a
+    if (sized.size != 123) return "fail 3"
+
+    return "OK"
+}