Migrate boxAgainstJava tests to multi-file framework

compiler/testData/codegen/boxAgainstJava/reflection/classLiterals/javaClassLiteral.kt

@@ -1,8 +1,13 @@
-import javaClassLiteral as J
+// FILE: J.java
+
+public class J {
+}
+
+// FILE: 1.kt
 
 fun box(): String {
     val j = J::class
-    if (j.simpleName != "javaClassLiteral") return "Fail: ${j.simpleName}"
+    if (j.simpleName != "J") return "Fail: ${j.simpleName}"
 
     return "OK"
 }