Don't overload FreeListElement for become.

runtime/vm/raw_object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/raw_object.h"
 
+#include "vm/become.h"
 #include "vm/class_table.h"
 #include "vm/dart.h"
 #include "vm/freelist.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/visitor.h"
 
 
 namespace dart {
 
@@ skipping 153 matching lines @@
       intptr_t num_handlers = raw_handlers->ptr()->num_entries_;
       instance_size = ExceptionHandlers::InstanceSize(num_handlers);
       break;
     }
     case kFreeListElement: {
       uword addr = RawObject::ToAddr(this);
       FreeListElement* element = reinterpret_cast<FreeListElement*>(addr);
       instance_size = element->Size();
       break;
     }
+    case kForwardingCorpse: {
+      uword addr = RawObject::ToAddr(this);
+      ForwardingCorpse* element = reinterpret_cast<ForwardingCorpse*>(addr);
+      instance_size = element->Size();
+      break;
+    }
     default: {
       // Get the (constant) instance size out of the class object.
       // TODO(koda): Add Size(ClassTable*) interface to allow caching in loops.
       Isolate* isolate = Isolate::Current();
 #if defined(DEBUG)
       ClassTable* class_table = isolate->class_table();
       if (!class_table->IsValidIndex(class_id) ||
           !class_table->HasValidClassAt(class_id)) {
         FATAL2("Invalid class id: %" Pd " from tags %" Px "\n",
                class_id, ptr()->tags_);
@@ skipping 91 matching lines @@
         size = RawInstance::VisitInstancePointers(raw_obj, visitor);
         break;
       }
 #undef RAW_VISITPOINTERS
       case kFreeListElement: {
         uword addr = RawObject::ToAddr(this);
         FreeListElement* element = reinterpret_cast<FreeListElement*>(addr);
         size = element->Size();
         break;
       }
+      case kForwardingCorpse: {
+        uword addr = RawObject::ToAddr(this);
+        ForwardingCorpse* forwarder = reinterpret_cast<ForwardingCorpse*>(addr);
+        size = forwarder->Size();
+        break;
+      }
       case kNullCid:
         size = Size();
         break;
       default:
         OS::Print("Class Id: %" Pd "\n", class_id);
         UNREACHABLE();
         break;
     }
   } else {
     RawInstance* raw_obj = reinterpret_cast<RawInstance*>(this);
@@ skipping 661 matching lines @@
 intptr_t RawUserTag::VisitUserTagPointers(
     RawUserTag* raw_obj, ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return UserTag::InstanceSize();
 }
 
 
 }  // namespace dart