[not for landing] Re-shuffle AllocationSite members

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 3a76a1758698f238cfe71b0a694bf3869f4fe596..de42c6d398a4594892f594fc03cae04e0faec20c 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1629,7 +1629,6 @@ void AllocationSite::Initialize() {
   SetElementsKind(GetInitialFastElementsKind());
   set_nested_site(Smi::FromInt(0));
   set_pretenure_data(0);
-  set_pretenure_create_count(0);
   set_dependent_code(DependentCode::cast(GetHeap()->empty_fixed_array()),
                      SKIP_WRITE_BARRIER);
 }
@@ -1747,11 +1746,15 @@ void AllocationSite::set_deopt_dependent_code(bool deopt) {
 }
 
 
-int AllocationSite::memento_create_count() { return pretenure_create_count(); }
+int AllocationSite::memento_create_count() {
+  int value = pretenure_data();
+  return MementoCreatedCountBits::decode(value);
+}
 
 
 void AllocationSite::set_memento_create_count(int count) {
-  set_pretenure_create_count(count);
+  int value = pretenure_data();
+  set_pretenure_data(MementoCreatedCountBits::update(value, count));
 }
 
 
@@ -5530,8 +5533,6 @@ ACCESSORS(ObjectTemplateInfo, internal_field_count, Object,
 ACCESSORS(AllocationSite, transition_info, Object, kTransitionInfoOffset)
 ACCESSORS(AllocationSite, nested_site, Object, kNestedSiteOffset)
 SMI_ACCESSORS(AllocationSite, pretenure_data, kPretenureDataOffset)
-SMI_ACCESSORS(AllocationSite, pretenure_create_count,
-              kPretenureCreateCountOffset)
 ACCESSORS(AllocationSite, dependent_code, DependentCode,
           kDependentCodeOffset)
 ACCESSORS(AllocationSite, weak_next, Object, kWeakNextOffset)