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

vm/flow_graph_allocator.h

+// 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_FLOW_GRAPH_ALLOCATOR_H_
+#define VM_FLOW_GRAPH_ALLOCATOR_H_
+
+#include "vm/growable_array.h"
+#include "vm/intermediate_language.h"
+
+namespace dart {

[srdjan, 2012/06/22 14:10:20]

Maybe add a comment that this is a register allocator, and say something about
it.

+
+class FlowGraphAllocator : public ValueObject {
+ public:
+  explicit FlowGraphAllocator(const GrowableArray<BlockEntryInstr*>& blocks)
+      : blocks_(blocks) { }
+
+  void ResolveConstraints();
+
+ private:
+  const GrowableArray<BlockEntryInstr*>& blocks_;
+
+  DISALLOW_COPY_AND_ASSIGN(FlowGraphAllocator);
+};
+
+}  // namespace dart
+
+#endif  // VM_FLOW_GRAPH_ALLOCATOR_H_