Turn off tracking of fields for the roll.

src/lithium-allocator.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 1320 matching lines @@
         iterator.Advance();
       }
 
       for (int i = block->block_id() + 1; i <= back_edge->block_id(); ++i) {
         live_in_sets_[i]->Union(*live);
       }
     }
 
 #ifdef DEBUG
     if (block_id == 0) {
-      ALLOW_HANDLE_DEREF(isolate(), "Printing debug information");
       BitVector::Iterator iterator(live);
       bool found = false;
       while (!iterator.Done()) {
         found = true;
         int operand_index = iterator.Current();
         if (chunk_->info()->IsStub()) {
           CodeStub::Major major_key = chunk_->info()->code_stub()->MajorKey();
           PrintF("Function: %s\n", CodeStub::MajorName(major_key, false));
         } else {
           ASSERT(chunk_->info()->IsOptimizing());
@@ skipping 834 matching lines @@
     LiveRange* current = live_ranges()->at(i);
     if (current != NULL) current->Verify();
   }
 }
 
 
 #endif
 
 
 } }  // namespace v8::internal