Revert "Introduce FeedbackNexus for vector-based ics."

src/ic/ic-inl.h

Index: src/ic/ic-inl.h
diff --git a/src/ic/ic-inl.h b/src/ic/ic-inl.h
index 22f66d0409b03d45ce443c95caf897d4cb5d8628..91b8955fd47ca08b7eb2cd6d63aa788cf67efb23 100644
--- a/src/ic/ic-inl.h
+++ b/src/ic/ic-inl.h
@@ -208,12 +208,30 @@ Handle<Map> IC::GetICCacheHolder(HeapType* type, Isolate* isolate,
 }
 
 
-inline Code* IC::get_host() {
+inline Code* CallIC::get_host() {
   return isolate()
       ->inner_pointer_to_code_cache()
       ->GetCacheEntry(address())
       ->code;
 }
+
+
+// static
+IC::State CallIC::FeedbackToState(Isolate* isolate, TypeFeedbackVector* vector,
+                                  FeedbackVectorICSlot slot) {
+  IC::State state = UNINITIALIZED;
+  Object* feedback = vector->Get(slot);
+
+  if (feedback == *TypeFeedbackVector::MegamorphicSentinel(isolate)) {
+    state = GENERIC;
+  } else if (feedback->IsAllocationSite() || feedback->IsJSFunction()) {
+    state = MONOMORPHIC;
+  } else {
+    CHECK(feedback == *TypeFeedbackVector::UninitializedSentinel(isolate));
+  }
+
+  return state;
+}
 }
 }  // namespace v8::internal