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

runtime/vm/native_arguments.cc

Index: runtime/vm/native_arguments.cc
diff --git a/runtime/vm/native_arguments.cc b/runtime/vm/native_arguments.cc
index 2f33efa859392bf4d86a7bd6e7d32b341ed4e0ce..52ef57ff2704e5b04bb166215207d7a2e34399a0 100644
--- a/runtime/vm/native_arguments.cc
+++ b/runtime/vm/native_arguments.cc
@@ -1,10 +1,10 @@
-// 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/native_arguments.h"
 
-#include "vm/assert.h"
+#include "platform/assert.h"
 #include "vm/object.h"
 
 namespace dart {