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

runtime/vm/constants_ia32.h

Index: runtime/vm/constants_ia32.h
diff --git a/runtime/vm/constants_ia32.h b/runtime/vm/constants_ia32.h
index 18be009bf0b93699dfd453b709324a8aa0cd7d35..683da5edcbaaca5bfea2b8ec574e39e2dc78021f 100644
--- a/runtime/vm/constants_ia32.h
+++ b/runtime/vm/constants_ia32.h
@@ -1,11 +1,11 @@
-// 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_CONSTANTS_IA32_H_
 #define VM_CONSTANTS_IA32_H_
 
-#include "vm/assert.h"
+#include "platform/assert.h"
 
 namespace dart {