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

runtime/vm/memory_region.h

Index: runtime/vm/memory_region.h
diff --git a/runtime/vm/memory_region.h b/runtime/vm/memory_region.h
index 9078a781388c43d12271eb6f04c229e32d2a2398..c9543c23c1711c0472c16dd8885824bd2b7843d7 100644
--- a/runtime/vm/memory_region.h
+++ b/runtime/vm/memory_region.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_MEMORY_REGION_H_
 #define VM_MEMORY_REGION_H_
 
-#include "vm/assert.h"
+#include "platform/assert.h"
+#include "vm/globals.h"
 
 namespace dart {