Reland of Type Feedback Vector lives in the closure

src/type-feedback-vector-inl.h

Index: src/type-feedback-vector-inl.h
diff --git a/src/type-feedback-vector-inl.h b/src/type-feedback-vector-inl.h
index 97df1b9ae994abac87a7615d865a08bede05192c..f3f5929fef20e26f5462625a44d138ffa5db6292 100644
--- a/src/type-feedback-vector-inl.h
+++ b/src/type-feedback-vector-inl.h
@@ -80,17 +80,17 @@ FeedbackVectorSlotKind TypeFeedbackVector::GetKind(
   return metadata()->GetKind(slot);
 }
 
-
-int TypeFeedbackVector::GetIndex(FeedbackVectorSlot slot) const {
-  DCHECK(slot.ToInt() < slot_count());
+// static
+int TypeFeedbackVector::GetIndex(FeedbackVectorSlot slot) {
   return kReservedIndexCount + slot.ToInt();
 }
 
 
 // Conversion from an integer index to either a slot or an ic slot. The caller
 // should know what kind she expects.
-FeedbackVectorSlot TypeFeedbackVector::ToSlot(int index) const {
-  DCHECK(index >= kReservedIndexCount && index < length());
+// static
+FeedbackVectorSlot TypeFeedbackVector::ToSlot(int index) {
+  DCHECK(index >= kReservedIndexCount);
   return FeedbackVectorSlot(index - kReservedIndexCount);
 }