With --noopt run unoptimized code through optimizer, more optimizations can be done later.

runtime/vm/constant_propagator.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/constant_propagator.h"
 
 #include "vm/bit_vector.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
 #include "vm/flow_graph_range_analysis.h"
@@ skipping 684 matching lines @@
 
 
 void ConstantPropagator::VisitInitStaticField(InitStaticFieldInstr* instr) {
   // Nothing to do.
 }
 
 
 void ConstantPropagator::VisitLoadStaticField(LoadStaticFieldInstr* instr) {
   const Field& field = instr->StaticField();
   ASSERT(field.is_static());
-  if (field.is_final()) {
-    Instance& obj = Instance::Handle(I, field.value());
-    ASSERT(obj.raw() != Object::sentinel().raw());
-    ASSERT(obj.raw() != Object::transition_sentinel().raw());
+  Instance& obj = Instance::Handle(I, field.value());
+  if (field.is_final() && (obj.raw() != Object::sentinel().raw()) &&
+      (obj.raw() != Object::transition_sentinel().raw())) {
     if (obj.IsSmi() || obj.IsOld()) {
       SetValue(instr, obj);
       return;
     }
   }
   SetValue(instr, non_constant_);
 }
 
 
 void ConstantPropagator::VisitStoreStaticField(StoreStaticFieldInstr* instr) {
@@ skipping 957 matching lines @@
   graph_->MergeBlocks();
   GrowableArray<BitVector*> dominance_frontier;
   graph_->ComputeDominators(&dominance_frontier);
 
   if (FLAG_trace_constant_propagation) {
     FlowGraphPrinter::PrintGraph("After CP", graph_);
   }
 }
 
 }  // namespace dart