AllocationSite objects weakly linked for traversal

src/objects-visiting.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 164 matching lines @@
     case EXTERNAL_FLOAT_ARRAY_TYPE:
     case EXTERNAL_DOUBLE_ARRAY_TYPE:
       return GetVisitorIdForSize(kVisitDataObject,
                                  kVisitDataObjectGeneric,
                                  instance_size);
 
 #define MAKE_STRUCT_CASE(NAME, Name, name) \
         case NAME##_TYPE:
       STRUCT_LIST(MAKE_STRUCT_CASE)
 #undef MAKE_STRUCT_CASE
+          if (instance_type == ALLOCATION_SITE_TYPE) {
+            return kVisitAllocationSite;
+          }
+
           return GetVisitorIdForSize(kVisitStruct,
                                      kVisitStructGeneric,
                                      instance_size);
 
     default:
       UNREACHABLE();
       return kVisitorIdCount;
   }
 }
 
 } }  // namespace v8::internal