[type-feedback-vector] Delete unused DiffersFrom().

src/type-feedback-vector.cc

 // 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.
 
 #include "src/type-feedback-vector.h"
 
 #include "src/code-stubs.h"
 #include "src/ic/ic-inl.h"
 #include "src/ic/ic-state.h"
 #include "src/objects.h"
@@ skipping 104 matching lines @@
     int entry_size = TypeFeedbackMetadata::GetSlotSize(kind);
 
     if (kind != other_spec->GetKind(slot)) {
       return true;
     }
     i += entry_size;
   }
   return false;
 }
 
-bool TypeFeedbackMetadata::DiffersFrom(
-    const TypeFeedbackMetadata* other_metadata) const {
-  if (other_metadata->slot_count() != slot_count()) {
-    return true;
-  }
-
-  int slots = slot_count();
-  for (int i = 0; i < slots;) {
-    FeedbackVectorSlot slot(i);
-    FeedbackVectorSlotKind kind = GetKind(slot);
-    int entry_size = TypeFeedbackMetadata::GetSlotSize(kind);
-    if (GetKind(slot) != other_metadata->GetKind(slot)) {
-      return true;
-    }
-    i += entry_size;
-  }
-  return false;
-}
 
 const char* TypeFeedbackMetadata::Kind2String(FeedbackVectorSlotKind kind) {
   switch (kind) {
     case FeedbackVectorSlotKind::INVALID:
       return "INVALID";
     case FeedbackVectorSlotKind::CALL_IC:
       return "CALL_IC";
     case FeedbackVectorSlotKind::LOAD_IC:
       return "LOAD_IC";
     case FeedbackVectorSlotKind::LOAD_GLOBAL_IC:
@@ skipping 893 matching lines @@
 void StoreDataPropertyInLiteralICNexus::ConfigureMonomorphic(
     Handle<Name> name, Handle<Map> receiver_map) {
   Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map);
 
   SetFeedback(*cell);
   SetFeedbackExtra(*name);
 }
 
 }  // namespace internal
 }  // namespace v8