AllocationSite objects weakly linked for traversal

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 7b06b8732ad03928d97d3dfcf16483b7633a39c5..d1c526ddfe32f7ff945ef4b6786e20ad6019fa72 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1706,7 +1706,11 @@ void HeapObject::IterateBody(InstanceType type, int object_size,
         case NAME##_TYPE:
       STRUCT_LIST(MAKE_STRUCT_CASE)
 #undef MAKE_STRUCT_CASE
-      StructBodyDescriptor::IterateBody(this, object_size, v);
+      if (type == ALLOCATION_SITE_TYPE) {
+        reinterpret_cast<AllocationSite*>(this)->AllocationSiteIterateBody(v);
+      } else {
+        StructBodyDescriptor::IterateBody(this, object_size, v);
+      }
       break;
     default:
       PrintF("Unknown type: %d\n", type);