Merged FeedbackSlotInterface into AstNode, removing the need for a 2nd vtable.

src/feedback-slots.h

Index: src/feedback-slots.h
diff --git a/src/feedback-slots.h b/src/feedback-slots.h
deleted file mode 100644
index 9951fc8fdcc0c77af3f7f35a3d3246fc3398444f..0000000000000000000000000000000000000000
--- a/src/feedback-slots.h
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef V8_FEEDBACK_SLOTS_H_
-#define V8_FEEDBACK_SLOTS_H_
-
-#include "src/v8.h"
-
-#include "src/isolate.h"
-
-namespace v8 {
-namespace internal {
-
-class FeedbackSlotInterface {
- public:
-  static const int kInvalidFeedbackSlot = -1;
-
-  virtual ~FeedbackSlotInterface() {}
-
-  virtual int ComputeFeedbackSlotCount() = 0;
-  virtual void SetFirstFeedbackSlot(int slot) = 0;
-};
-
-} }  // namespace v8::internal
-
-#endif  // V8_FEEDBACK_SLOTS_H_