Move assert.h/assert.cc from runtime/vm to runtime/platform

runtime/vm/snapshot.cc

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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 "vm/snapshot.h"
 
-#include "vm/assert.h"
+#include "platform/assert.h"
 #include "vm/bootstrap.h"
 #include "vm/heap.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 
 namespace dart {
 
 enum {
   kInstanceId = ObjectStore::kMaxId,
   kMaxPredefinedObjectIds,
@@ skipping 436 matching lines @@
 
 
 void SnapshotWriterVisitor::VisitPointers(RawObject** first, RawObject** last) {
   for (RawObject** current = first; current <= last; current++) {
     RawObject* raw_obj = *current;
     writer_->WriteObject(raw_obj);
   }
 }
 
 }  // namespace dart