Add test methods and data base on raw fir builder test data

compiler/visualizer/testData/rawBuilder/declarations/enums2.kt

@@ -0,0 +1,28 @@
+interface Some
+
+object O1 : Some
+
+object O2 : Some
+
+enum class SomeEnum(val x: Some) {
+//       constructor SomeEnum(Some)
+//       │object O1: Some
+//       ││    
+    FIRST(O1) {
+//                                             Boolean
+//                                             │
+        override fun check(y: Some): Boolean = true
+    },
+//        constructor SomeEnum(Some)
+//        │object O2: Some
+//        ││     
+    SECOND(O2)  {
+//                                             SomeEnum.SECOND.check.y: Some
+//                                             │ fun (Any).equals(Any?): Boolean
+//                                             │ │  object O2: Some
+//                                             │ │  │ 
+        override fun check(y: Some): Boolean = y == O2
+    };
+
+    abstract fun check(y: Some): Boolean
+}