TurboFan calls to vector-based ics need to resolve a slot to an index.

src/compiler/js-operator.h

Index: src/compiler/js-operator.h
diff --git a/src/compiler/js-operator.h b/src/compiler/js-operator.h
index b659292d6680f7e2cd9a3c3a1cc4d8b17c41ddce..1ce8173d61ea3094ae3d5941731514501d4acacd 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -104,6 +104,8 @@ class VectorSlotPair {
   Handle<TypeFeedbackVector> vector() const { return vector_; }
   FeedbackVectorICSlot slot() const { return slot_; }
 
+  int index() const { return vector_->GetIndex(slot_); }
+
  private:
   const Handle<TypeFeedbackVector> vector_;
   const FeedbackVectorICSlot slot_;