Use PassiveObject were possible.

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, 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/intermediate_language.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/bit_vector.h"
 #include "vm/cpu.h"
 #include "vm/dart_entry.h"
@@ skipping 1968 matching lines @@
     if (!MayBeBoxableNumber(compare->left()->Type()->ToCid()) ||
         !MayBeBoxableNumber(compare->right()->Type()->ToCid()))  {
       compare->set_needs_number_check(false);
     } else if (!MaybeNumber(compare->left()->Type()) ||
                !MaybeNumber(compare->right()->Type())) {
       compare->set_needs_number_check(false);
     }
   }
 
   *negated = false;
-  Object& constant = Object::Handle();
+  PassiveObject& constant = PassiveObject::Handle();
   Value* other = NULL;
   if (compare->right()->BindsToConstant()) {
     constant = compare->right()->BoundConstant().raw();
     other = compare->left();
   } else if (compare->left()->BindsToConstant()) {
     constant = compare->left()->BoundConstant().raw();
     other = compare->right();
   } else {
     return compare;
   }
@@ skipping 1088 matching lines @@
     case Token::kTRUNCDIV: return 0;
     case Token::kMOD: return 1;
     default: UNIMPLEMENTED(); return -1;
   }
 }
 
 
 #undef __
 
 }  // namespace dart