vector-based ICs did not update type feedback counts correctly.

src/objects.cc

 // Copyright 2013 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 <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
@@ skipping 10479 matching lines @@
       if (kind == NULL || *kind == target->kind()) {
         IC::Clear(this->GetIsolate(), info->pc(),
                   info->host()->constant_pool());
       }
     }
   }
 }
 
 
 void SharedFunctionInfo::ClearTypeFeedbackInfo() {
-  TypeFeedbackVector* vector = feedback_vector();
-  Heap* heap = GetHeap();
-  int length = vector->length();
-
-  for (int i = 0; i < length; i++) {
-    Object* obj = vector->get(i);
-    if (obj->IsHeapObject()) {
-      InstanceType instance_type =
-          HeapObject::cast(obj)->map()->instance_type();
-      switch (instance_type) {
-        case ALLOCATION_SITE_TYPE:
-          // AllocationSites are not cleared because they do not store
-          // information that leaks.
-          break;
-          // Fall through...
-        default:
-          vector->set(i, TypeFeedbackVector::RawUninitializedSentinel(heap),
-                      SKIP_WRITE_BARRIER);
-      }
-    }
-  }
+  feedback_vector()->ClearSlots(this);
 }
 
 
 BailoutId Code::TranslatePcOffsetToAstId(uint32_t pc_offset) {
   DisallowHeapAllocation no_gc;
   DCHECK(kind() == FUNCTION);
   BackEdgeTable back_edges(this, &no_gc);
   for (uint32_t i = 0; i < back_edges.length(); i++) {
     if (back_edges.pc_offset(i) == pc_offset) return back_edges.ast_id(i);
   }
@@ skipping 5984 matching lines @@
   Handle<DependentCode> codes =
       DependentCode::Insert(handle(cell->dependent_code(), info->isolate()),
                             DependentCode::kPropertyCellChangedGroup,
                             info->object_wrapper());
   if (*codes != cell->dependent_code()) cell->set_dependent_code(*codes);
   info->dependencies(DependentCode::kPropertyCellChangedGroup)->Add(
       cell, info->zone());
 }
 
 } }  // namespace v8::internal