Pretenuring calculation fields in AllocationSite.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 2e8c0ada3877b3633e34c5f4d9732c94868de3c2..a386b821ceeb3532bd553eaba7e43a8ae3d15ab9 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1314,6 +1314,9 @@ void AllocationSite::Initialize() {
   set_transition_info(Smi::FromInt(0));
   SetElementsKind(GetInitialFastElementsKind());
   set_nested_site(Smi::FromInt(0));
+  set_memento_create_count(Smi::FromInt(0));
+  set_memento_found_count(Smi::FromInt(0));
+  set_pretenure_decision(Smi::FromInt(0));
   set_dependent_code(DependentCode::cast(GetHeap()->empty_fixed_array()),
                      SKIP_WRITE_BARRIER);
 }
@@ -4552,6 +4555,10 @@ ACCESSORS(TypeSwitchInfo, types, Object, kTypesOffset)
 
 ACCESSORS(AllocationSite, transition_info, Object, kTransitionInfoOffset)
 ACCESSORS(AllocationSite, nested_site, Object, kNestedSiteOffset)
+ACCESSORS_TO_SMI(AllocationSite, memento_found_count, kMementoFoundCountOffset)
+ACCESSORS_TO_SMI(AllocationSite, memento_create_count,
+                 kMementoCreateCountOffset)
+ACCESSORS_TO_SMI(AllocationSite, pretenure_decision, kPretenureDecisionOffset)
 ACCESSORS(AllocationSite, dependent_code, DependentCode,
           kDependentCodeOffset)
 ACCESSORS(AllocationSite, weak_next, Object, kWeakNextOffset)