Redundant array copy in Character.toString().

Several redundant array copies were adressed in JDK-4676426. It seems the one for Character.toString() was missed.

Character.toString() is implemented by using String.valueOf(char[]) but should be implemented with String.valueOf(char) to avoid one allocation of the character array.

Current implementation of Character.toString():

  public String toString() {
        char buf[] = {value};
        return String.valueOf(buf);
    }


Suggested implementation:

  public String toString() {
        return String.valueOf(value);
    }