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/annotations/CustomAnnotation.txt

@@ -14,9 +14,20 @@ public trait CustomAnnotation : java.lang.Object {
         
         public class object <class-object-for-MyEnum> {
             private constructor <class-object-for-MyEnum>()
-            public final val ONE: test.CustomAnnotation.MyEnum
             public final /*synthesized*/ fun valueOf(/*0*/ value: jet.String): test.CustomAnnotation.MyEnum
             public final /*synthesized*/ fun values(): jet.Array<test.CustomAnnotation.MyEnum>
+            
+            public enum entry ONE : test.CustomAnnotation.MyEnum {
+                private constructor ONE()
+                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-ONE> : test.CustomAnnotation.MyEnum.ONE {
+                    private constructor <class-object-for-ONE>()
+                    public final override /*1*/ /*fake_override*/ fun name(): jet.String
+                    public final override /*1*/ /*fake_override*/ fun ordinal(): jet.Int
+                }
+            }
         }
     }