tests for comparison of changes in classes

Original commit: ae7cc8e430

jps/jps-plugin/testData/comparison/classMembersOnlyChanged/classWithCompanionObjectChanged/old.kt

@@ -0,0 +1,21 @@
+package test
+
+class ClassWithAddedCompanionObject {
+    public fun unchangedFun() {}
+}
+
+class ClassWithRemovedCompanionObject {
+    public fun unchangedFun() {}
+    companion object {}
+}
+
+class ClassWithChangedCompanionObject {
+    public fun unchangedFun() {}
+    companion object FirstName {}
+}
+
+class ClassWithChangedVisibilityForCompanionObject {
+    public fun unchangedFun() {}
+    public companion object {}
+}
+