Double constants in code should be canonical.

runtime/vm/flow_graph_optimizer.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/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/cpu.h"
 #include "vm/dart_entry.h"
@@ skipping 621 matching lines @@
   } else if ((from == kTagged) && (to == kUnboxedDouble)) {
     ASSERT(CanUnboxDouble());
     ASSERT((deopt_target != NULL) ||
            (use->Type()->ToCid() == kDoubleCid));
     const intptr_t deopt_id = (deopt_target != NULL) ?
         deopt_target->DeoptimizationTarget() : Isolate::kNoDeoptId;
     ConstantInstr* constant = use->definition()->AsConstant();
     if ((constant != NULL) && constant->value().IsSmi()) {
       const double dbl_val = Smi::Cast(constant->value()).AsDoubleValue();
       const Double& dbl_obj =
-          Double::ZoneHandle(I, Double::New(dbl_val, Heap::kOld));
+          Double::ZoneHandle(I, Double::NewCanonical(dbl_val));
       ConstantInstr* double_const = flow_graph()->GetConstant(dbl_obj);
       converted = new(I) UnboxDoubleInstr(new(I) Value(double_const), deopt_id);
     } else {
       converted = new(I) UnboxDoubleInstr(use->CopyWithType(), deopt_id);
     }
   } else if ((from == kTagged) && (to == kUnboxedFloat32x4)) {
     ASSERT((deopt_target != NULL) ||
            (use->Type()->ToCid() == kFloat32x4Cid));
     const intptr_t deopt_id = (deopt_target != NULL) ?
         deopt_target->DeoptimizationTarget() : Isolate::kNoDeoptId;
@@ skipping 9150 matching lines @@
   }
 
   // Insert materializations at environment uses.
   for (intptr_t i = 0; i < exits.length(); i++) {
     CreateMaterializationAt(exits[i], alloc, alloc->cls(), *slots);
   }
 }
 
 
 }  // namespace dart