Add new files and data structures for the new register allocator.

vm/flow_graph_allocator.cc

+// 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/flow_graph_allocator.h"
+
+#include "vm/intermediate_language.h"
+
+namespace dart {
+
+void FlowGraphAllocator::ResolveConstraints() {
+  // TODO(fschneider): Resolve register constraints.
+}
+
+}  // namespace dart