Decompiler & stub builder fixed accordingly with new enum syntax.

Companion object now directly follows enum entries to avoid having them at the middle.
Some decompiler & stub builder tests fixed accordingly.

idea/testData/decompiler/decompiledText/Enum/Enum.kt

@@ -2,11 +2,14 @@ package test
 
 import dependency.*
 
-public enum class Enum : Tr {
-    ONE
-    TWO
-    THREE {
-        fun g() {
-        }
+enum class Enum {
+    A B C D E F {
+        override fun f() = 4
     }
+
+    companion object {
+        val c: Int = 1
+    }
+
+    open fun f() = 3
 }