7028133: Specify serialVersionUID for RegularEnumSet and JumboEnumSet

Reviewed-by: alanb, mduigou
Contributed-by: NNeil Richards <neil.richards@ngmr.net>

src/share/classes/java/util/JumboEnumSet.java

@@ -34,6 +34,8 @@ package java.util;
  * @serial exclude
  */
 class JumboEnumSet<E extends Enum<E>> extends EnumSet<E> {
+    private static final long serialVersionUID = 334349849919042784L;
+
     /**
      * Bit vector representation of this set.  The ith bit of the jth
      * element of this array represents the  presence of universe[64*j +i]

src/share/classes/java/util/RegularEnumSet.java

@@ -34,6 +34,7 @@ package java.util;
  * @serial exclude
  */
 class RegularEnumSet<E extends Enum<E>> extends EnumSet<E> {
+    private static final long serialVersionUID = 3411599620347842686L;
     /**
      * Bit vector representation of this set.  The 2^k bit indicates the
      * presence of universe[k] in this set.