Add more spcific ranges for String length and charCode methods.

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/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 997 matching lines @@
   load->set_result_cid(kSmiCid);
   return load;
 }
 
 
 void FlowGraphOptimizer::InlineStringLengthGetter(InstanceCallInstr* call) {
   // Check receiver class.
   AddCheckClass(call, call->ArgumentAt(0)->value()->Copy());
 
   LoadFieldInstr* load = BuildLoadStringLength(call->ArgumentAt(0)->value());
+  load->set_recognized_kind(MethodRecognizer::kStringBaseLength);
   call->ReplaceWith(load, current_iterator());
   RemovePushArguments(call);
 }
 
 
 void FlowGraphOptimizer::InlineStringIsEmptyGetter(InstanceCallInstr* call) {
   // Check receiver class.
   AddCheckClass(call, call->ArgumentAt(0)->value()->Copy());
 
   LoadFieldInstr* load = BuildLoadStringLength(call->ArgumentAt(0)->value());
@@ skipping 2876 matching lines @@
 
   if (FLAG_trace_constant_propagation) {
     OS::Print("\n==== After constant propagation ====\n");
     FlowGraphPrinter printer(*graph_);
     printer.PrintBlocks();
   }
 }
 
 
 }  // namespace dart