re PR libgcj/1758 (java.util package lacks TreeMap)

* java/util/TreeMap.java: New file.
        * java/util/TreeSet.java: New file.
        * Makefile.am: Add TreeMap and TreeSet. Enable WeakHashMap.
        * Makefile.in: Rebuilt.
        * java/util/HashSet.java (clone): Use constructor instead of calling
        clone on itself.
        * java/util/SortedSet.java: Sync with classpath.
        * java/util/HashMap.java (hash): Use if statement instead of ternary,
        for clarity.
	Resolves PR libgcj/1758.
	Resolves PR java/1684.

From-SVN: r39657

libjava/java/util/HashSet.java

@@ -45,8 +45,8 @@ import java.io.ObjectOutputStream;
  * HashSet is a part of the JDK1.2 Collections API.
  *
  * @author      Jon Zeppieri
- * @version     $Revision: 1.5 $
- * @modified    $Id: HashSet.java,v 1.5 2000/10/26 10:19:00 bryce Exp $
+ * @version     $Revision: 1.1 $
+ * @modified    $Id: HashSet.java,v 1.1 2000/12/11 03:47:47 bryce Exp $
  */
 public class HashSet extends AbstractSet
   implements Set, Cloneable, Serializable
@@ -128,10 +128,9 @@ public class HashSet extends AbstractSet
    */
   public Object clone()
   {
-    HashSet copy = null;
+    HashSet copy = new HashSet();
     try
       {
-	copy = (HashSet) super.clone();
 	copy.map = (HashMap) map.clone();
       }
     catch (CloneNotSupportedException ex)