Fix crash with --code-comments.

runtime/vm/il_printer.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/il_printer.h"
 
 #include "vm/intermediate_language.h"
 #include "vm/os.h"
 #include "vm/parser.h"
 
@@ skipping 113 matching lines @@
       const Class& cls =
           Class::Handle(Isolate::Current()->class_table()->At(class_ids[k]));
       f->Print("%s", String::Handle(cls.Name()).ToCString());
     }
   }
   f->Print("]");
 }
 
 
 void Computation::PrintTo(BufferFormatter* f) const {
-  f->Print("%s:%d(", DebugName(), deopt_id());
+  // Do not access 'deopt_id()' as it asserts that the computation can
+  // deoptimize.
+  f->Print("%s:%d(", DebugName(), deopt_id_);
   PrintOperandsTo(f);
   f->Print(")");
   if (HasICData()) {
     PrintICData(f, *ic_data());
   }
 }
 
 
 void Computation::PrintOperandsTo(BufferFormatter* f) const {
   for (int i = 0; i < InputCount(); ++i) {
@@ skipping 717 matching lines @@
     if ((locations_ != NULL) && !locations_[i].IsInvalid()) {
       f->Print(" [");
       locations_[i].PrintTo(f);
       f->Print("]");
     }
   }
   f->Print(" }");
 }
 
 }  // namespace dart