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

runtime/vm/allocation.h

Index: runtime/vm/allocation.h
diff --git a/runtime/vm/allocation.h b/runtime/vm/allocation.h
index 4338583da26aea4b1c12ee2836a3ccf5a8c2aabd..e77fd3dc6294a72217789d860fc10079e2fb7627 100644
--- a/runtime/vm/allocation.h
+++ b/runtime/vm/allocation.h
@@ -1,11 +1,12 @@
-// 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.
 
 #ifndef VM_ALLOCATION_H_
 #define VM_ALLOCATION_H_
 
-#include "vm/assert.h"
+#include "platform/assert.h"
+#include "vm/globals.h"
 
 namespace dart {