Added check for trailing whitespaces and corrected existing violations.

test/mjsunit/regress/regress-747.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 22 matching lines @@
 
 (function() {
   var x = 42;
   this.callEval = function() {eval('x');};
 })();
 
 try {
   callEval();
 } catch (e) {
   assertUnreachable();
-} 
+}
 
 gc();
 gc();
 gc();
 gc();
 gc();
 gc();
 
 try {
   callEval();
 } catch (e) {
   assertUnreachable();
-} 
+}