[heap] Use HashMap as scratchpad backing store

src/heap/scavenger-inl.h

 // Copyright 2015 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_HEAP_SCAVENGER_INL_H_
 #define V8_HEAP_SCAVENGER_INL_H_
 
 #include "src/heap/scavenger.h"
 
 namespace v8 {
@@ skipping 10 matching lines @@
 
   // If the first word is a forwarding address, the object has already been
   // copied.
   if (first_word.IsForwardingAddress()) {
     HeapObject* dest = first_word.ToForwardingAddress();
     DCHECK(object->GetIsolate()->heap()->InFromSpace(*p));
     *p = dest;
     return;
   }
 
-  Heap::UpdateAllocationSiteFeedback(object, Heap::IGNORE_SCRATCHPAD_SLOT);
+  object->GetHeap()->UpdateAllocationSite(
+      object, object->GetHeap()->global_pretenuring_feedback_);
 
   // AllocationMementos are unrooted and shouldn't survive a scavenge
   DCHECK(object->map() != object->GetHeap()->allocation_memento_map());
   // Call the slow part of scavenge object.
   return ScavengeObjectSlow(p, object);
 }
 
 
 // static
 void StaticScavengeVisitor::VisitPointer(Heap* heap, HeapObject* obj,
                                          Object** p) {
   Object* object = *p;
   if (!heap->InNewSpace(object)) return;
   Scavenger::ScavengeObject(reinterpret_cast<HeapObject**>(p),
                             reinterpret_cast<HeapObject*>(object));
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_SCAVENGER_INL_H_