Store transition on HStoreNamedField as HConstant.

src/hydrogen-instructions.cc

 // Copyright 2012 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 1669 matching lines @@
 
 
 void HCheckMaps::HandleSideEffectDominator(GVNFlag side_effect,
                                            HValue* dominator) {
   ASSERT(side_effect == kChangesMaps);
   // TODO(mstarzinger): For now we specialize on HStoreNamedField, but once
   // type information is rich enough we should generalize this to any HType
   // for which the map is known.
   if (HasNoUses() && dominator->IsStoreNamedField()) {
     HStoreNamedField* store = HStoreNamedField::cast(dominator);
-    UniqueValueId map_unique_id = store->transition_unique_id();
-    if (!map_unique_id.IsInitialized() || store->object() != value()) return;
+    if (!store->has_transition() || store->object() != value()) return;
+    HConstant* transition = HConstant::cast(store->transition());
     for (int i = 0; i < map_set()->length(); i++) {
-      if (map_unique_id == map_unique_ids_.at(i)) {
+      if (transition->UniqueValueIdsMatch(map_unique_ids_.at(i))) {
         DeleteAndReplaceWith(NULL);
         return;
       }
     }
   }
 }
 
 
 void HCheckMaps::PrintDataTo(StringStream* stream) {
   value()->PrintNameTo(stream);
@@ skipping 1811 matching lines @@
 
 
 void HStoreNamedField::PrintDataTo(StringStream* stream) {
   object()->PrintNameTo(stream);
   access_.PrintTo(stream);
   stream->Add(" = ");
   value()->PrintNameTo(stream);
   if (NeedsWriteBarrier()) {
     stream->Add(" (write-barrier)");
   }
-  if (!transition().is_null()) {
-    stream->Add(" (transition map %p)", *transition());
+  if (has_transition()) {
+    stream->Add(" (transition map %p)", *transition_map());
   }
 }
 
 
 void HStoreKeyed::PrintDataTo(StringStream* stream) {
   if (!is_external()) {
     elements()->PrintNameTo(stream);
   } else {
     elements()->PrintNameTo(stream);
     stream->Add(".");
@@ skipping 942 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal