Change enum entry resolution strategy in JDR

Enum entry is now resolved into a class with a class object, which inherits
from the former class, as in the other parts of the compiler. Create a special
class EnumEntrySyntheticClassDescriptor which will be reused in deserialization
later

compiler/testData/loadJava/compiledJava/static/StaticMembersInEnum.txt

@@ -7,9 +7,20 @@ public final enum class StaticMembersInEnum : jet.Enum<test.StaticMembersInEnum>
     
     public class object <class-object-for-StaticMembersInEnum> {
         private constructor <class-object-for-StaticMembersInEnum>()
-        public final val ENTRY: test.StaticMembersInEnum
         public final /*synthesized*/ fun valueOf(/*0*/ value: jet.String): test.StaticMembersInEnum
         public final /*synthesized*/ fun values(): jet.Array<test.StaticMembersInEnum>
+        
+        public enum entry ENTRY : test.StaticMembersInEnum {
+            private constructor ENTRY()
+            public final override /*1*/ /*fake_override*/ fun name(): jet.String
+            public final override /*1*/ /*fake_override*/ fun ordinal(): jet.Int
+            
+            public class object <class-object-for-ENTRY> : test.StaticMembersInEnum.ENTRY {
+                private constructor <class-object-for-ENTRY>()
+                public final override /*1*/ /*fake_override*/ fun name(): jet.String
+                public final override /*1*/ /*fake_override*/ fun ordinal(): jet.Int
+            }
+        }
     }
 }