* java/util/TreeMap.java: New file.

    * 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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@39657 138bc75d-0d04-0410-961f-82ee72b054a4