dart2js: Remove heap-growth-flag that was passed to the VM.

pkg/compiler/lib/src/dart2js_stress.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.stress;
 import "dart2js.dart" as dart2js;
 
 const ITERATIONS_FLAG_PREFIX = "--iterations=";
 void main(List<String> args) {
-  print("Reminder: for best performance, "
-        "dart2js should be run with the VM flag --heap_growth_rate=512");
   Stopwatch sw = new Stopwatch();
   int count = 0;
   int maxCount = null;
   if (args.isNotEmpty && args[0].startsWith(ITERATIONS_FLAG_PREFIX)) {
     maxCount = int.parse(args[0].substring(ITERATIONS_FLAG_PREFIX.length));
     args = args.sublist(1);
   }
   if (maxCount == null) {
     print("Running indefinitely.\n"
           "Use '$ITERATIONS_FLAG_PREFIX<count>' to set a repetition count"
           " (as first flag).");
   }
   args = ["--suppress-warnings", "--suppress-hints"]..addAll(args);
   void iterate() {
     count++;
     sw.reset();
     sw.start();
     dart2js.internalMain(args)
       .then((_) {
         print("$count: ${sw.elapsedMilliseconds}ms");
       })
       .then((_) {
         if (maxCount == null || count < maxCount) {
           iterate();
         }
       });
   }
   iterate();
 }