delete useless comments

git-svn-id: https://wala.svn.sourceforge.net/svnroot/wala/trunk@1285 f5eafffb-2e1d-0410-98e4-8ec43c5233c4

com.ibm.wala.core/src/com/ibm/wala/util/perf/Stopwatch.java

@@ -24,22 +24,13 @@ public class Stopwatch {
 
   private long startTime;
 
-  /**
-   * Constructor Stopwatch.
-   */
   public Stopwatch() {
   }
 
-  /**
-   * Method start.
-   */
   public void start() {
     startTime = System.currentTimeMillis();
   }
 
-  /**
-   * Method stop.
-   */
   public void stop() {
     double endTime = System.currentTimeMillis();
     count++;