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

runtime/vm/flags.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/flags.h"
 
-#include "vm/assert.h"
+#include "platform/assert.h"
 #include "vm/os.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, print_flags, false, "Print flags as they are being parsed.");
 DEFINE_FLAG(bool, ignore_unrecognized_flags, false,
     "Ignore unrecognized flags.");
 
 // List of registered flags.
 Flag* Flags::flags_ = NULL;
@@ skipping 253 matching lines @@
     while (flag != NULL) {
       flag->Print();
       flag = flag->next_;
     }
   }
 
   return true;
 }
 
 }  // namespace dart