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/EnumMembers.java

@@ -0,0 +1,16 @@
+package test;
+
+public enum EnumMembers {
+    FIRST(true),
+    SECOND(false);
+
+    public final boolean isFirst;
+
+    private EnumMembers(boolean isFirst) {
+        this.isFirst = isFirst;
+    }
+
+    public boolean first() {
+        return isFirst;
+    }
+}