Create AllocationSite objects, pointed to by AllocationSiteInfo.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 5cc791515bc128b4ab788a9fa3e9bc39efb9817b..673d428277150f474a57d2d8664b12bdb7c252d6 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -210,8 +210,9 @@ static MaybeObject* ArrayCodeGenericCommon(Arguments* args,
     if (maybe_array->IsFailure()) return maybe_array;
 
     AllocationSiteInfo* info = AllocationSiteInfo::FindForJSObject(array);
-    ElementsKind to_kind = array->GetElementsKind();
-    if (info != NULL && info->GetElementsKindPayload(&to_kind)) {
+    if (info != NULL && info->site_is_valid()) {
+      AllocationSite* site = info->allocation_site_casted();
+      ElementsKind to_kind = site->GetElementsKindPayload();
       if (IsMoreGeneralElementsKindTransition(array->GetElementsKind(),
                                               to_kind)) {
         // We have advice that we should change the elements kind