update vector ics to handle megamorphic keyed loads

src/type-feedback-vector-inl.h

 // Copyright 2012 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.
 
 #ifndef V8_TYPE_FEEDBACK_VECTOR_INL_H_
 #define V8_TYPE_FEEDBACK_VECTOR_INL_H_
 
 #include "src/type-feedback-vector.h"
 
 namespace v8 {
@@ skipping 12 matching lines @@
 Handle<Object> TypeFeedbackVector::MegamorphicSentinel(Isolate* isolate) {
   return isolate->factory()->megamorphic_symbol();
 }
 
 
 Handle<Object> TypeFeedbackVector::PremonomorphicSentinel(Isolate* isolate) {
   return isolate->factory()->premonomorphic_symbol();
 }
 
 
-Handle<Object> TypeFeedbackVector::GenericSentinel(Isolate* isolate) {
-  return isolate->factory()->generic_symbol();
-}
-
-
 Handle<Object> TypeFeedbackVector::MonomorphicArraySentinel(
     Isolate* isolate, ElementsKind elements_kind) {
   return Handle<Object>(Smi::FromInt(static_cast<int>(elements_kind)), isolate);
 }
 
 
 Object* TypeFeedbackVector::RawUninitializedSentinel(Heap* heap) {
   return heap->uninitialized_symbol();
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_TYPE_FEEDBACK_VECTOR_INL_H_