Fixed printing during DCE.

src/hydrogen-dce.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/hydrogen-dce.h"
 #include "src/v8.h"
 
 namespace v8 {
 namespace internal {
 
@@ skipping 14 matching lines @@
         input->SetFlag(HValue::kIsLive);
         worklist->Add(input, zone());
         if (FLAG_trace_dead_code_elimination) PrintLive(instr, input);
       }
     }
   }
 }
 
 
 void HDeadCodeEliminationPhase::PrintLive(HValue* ref, HValue* instr) {
+  AllowHandleDereference allow_deref;
   OFStream os(stdout);
   os << "[MarkLive ";
   if (ref != NULL) {
     os << *ref;
   } else {
-    os << "root ";
+    os << "root";
   }
   os << " -> " << *instr << "]" << std::endl;
 }
 
 
 void HDeadCodeEliminationPhase::MarkLiveInstructions() {
   ZoneList<HValue*> worklist(10, zone());
 
   // Transitively mark all live instructions, starting from roots.
   for (int i = 0; i < graph()->blocks()->length(); ++i) {
@@ skipping 44 matching lines @@
     HPhi* phi = worklist.RemoveLast();
     HBasicBlock* block = phi->block();
     phi->DeleteAndReplaceWith(NULL);
     if (phi->HasMergedIndex()) {
       block->RecordDeletedPhi(phi->merged_index());
     }
   }
 }
 
 } }  // namespace v8::internal