- Remove redundant (and wrong) flushing of store buffers in unit test.

runtime/vm/thread_test.cc

 // Copyright (c) 2012, 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.
 
 #include "platform/assert.h"
 #include "vm/isolate.h"
 #include "vm/lockers.h"
 #include "vm/unit_test.h"
 #include "vm/profiler.h"
 #include "vm/thread_pool.h"
@@ skipping 548 matching lines @@
   Isolate* isolate_;
   Monitor* done_monitor_;
   bool* done_;
 };
 
 
 TEST_CASE(HelperAllocAndGC) {
   Monitor done_monitor;
   bool done = false;
   Isolate* isolate = Thread::Current()->isolate();
-  // Flush store buffers, etc.
-  // TODO(koda): Currently, the GC only does this for the current thread, (i.e,
-  // the helper, in this test), but it should be done for all *threads*
-  // while reaching a safepoint.
-  isolate->thread_registry()->PrepareForGC();
   Dart::thread_pool()->Run(new AllocAndGCTask(isolate, &done_monitor, &done));
   {
     while (true) {
       isolate->thread_registry()->CheckSafepoint();
       MonitorLocker ml(&done_monitor);
       if (done) {
         break;
       }
     }
   }
 }
 
 }  // namespace dart