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

runtime/vm/native_arguments.h

-// 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_NATIVE_ARGUMENTS_H_
 #define VM_NATIVE_ARGUMENTS_H_
 
-#include "vm/assert.h"
+#include "platform/assert.h"
 
 namespace dart {
 
 // Forward declarations.
 class Isolate;
 class Object;
 class RawObject;
 
 
 // Class NativeArguments is used to access arguments passed in from
@@ skipping 35 matching lines @@
  private:
   Isolate* isolate_;  // Current isolate pointer.
   int argc_;  // Number of arguments passed to the runtime call.
   RawObject*(*argv_)[];  // Pointer to an array of arguments to runtime call.
   RawObject** retval_;  // Pointer to the return value area.
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ARGUMENTS_H_