Fix a typo in the new compiler's optimizer.

runtime/vm/flow_graph_optimizer.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/flow_graph_optimizer.h"
 
 #include "vm/flow_graph_builder.h"
 #include "vm/il_printer.h"
 #include "vm/object_store.h"
 
@@ skipping 332 matching lines @@
         length_offset = Array::length_offset();
         break;
       case MethodRecognizer::kGrowableArrayLength:
         length_offset = GrowableObjectArray::length_offset();
         break;
       default:
         UNREACHABLE();
     }
     LoadVMFieldComp* load = new LoadVMFieldComp(
         comp->InputAt(0),
-        Array::length_offset(),
+        length_offset,
         Type::ZoneHandle(Type::IntInterface()),
         comp,
         ExtractClassIds(ic_data));
     load->set_instr(comp->instr());
     comp->instr()->replace_computation(load);
     return;
   }
 
   if (recognized_kind == MethodRecognizer::kStringBaseLength) {
     ASSERT(HasOneTarget(ic_data));
@@ skipping 150 matching lines @@
   instr->computation()->Accept(this);
 }
 
 
 void FlowGraphOptimizer::VisitBind(BindInstr* instr) {
   instr->computation()->Accept(this);
 }
 
 
 }  // namespace dart