Reland of Type Feedback Vector lives in the closure

src/type-feedback-vector.h

Index: src/type-feedback-vector.h
diff --git a/src/type-feedback-vector.h b/src/type-feedback-vector.h
index d83b77fa3e6f8e628f67f864f74291daf676066f..1e32a4769ddc179e9e2a0a509d07e0dcf0bed418 100644
--- a/src/type-feedback-vector.h
+++ b/src/type-feedback-vector.h
@@ -136,6 +136,8 @@ class TypeFeedbackMetadata : public FixedArray {
 
   bool SpecDiffersFrom(const FeedbackVectorSpec* other_spec) const;
 
+  bool DiffersFrom(const TypeFeedbackMetadata* other_metadata) const;
+
   // Returns number of slots in the vector.
   inline int slot_count() const;
 
@@ -194,12 +196,12 @@ class TypeFeedbackVector : public FixedArray {
   inline TypeFeedbackMetadata* metadata() const;
 
   // Conversion from a slot to an integer index to the underlying array.
-  inline int GetIndex(FeedbackVectorSlot slot) const;
+  static inline int GetIndex(FeedbackVectorSlot slot);
   static int GetIndexFromSpec(const FeedbackVectorSpec* spec,
                               FeedbackVectorSlot slot);
 
   // Conversion from an integer index to the underlying array to a slot.
-  inline FeedbackVectorSlot ToSlot(int index) const;
+  static inline FeedbackVectorSlot ToSlot(int index);
   inline Object* Get(FeedbackVectorSlot slot) const;
   inline void Set(FeedbackVectorSlot slot, Object* value,
                   WriteBarrierMode mode = UPDATE_WRITE_BARRIER);