Add result cid to StringFromCharCode.

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 1166 matching lines @@
     return true;
   }
   if ((recognized_kind == MethodRecognizer::kStringBaseCharAt) &&
       (ic_data.NumberOfChecks() == 1) &&
       (class_ids[0] == kOneByteStringCid)) {
     // TODO(fschneider): Handle TwoByteString.
     StringCharCodeAtInstr* load_char_code =
         BuildStringCharCodeAt(call, class_ids[0]);
     InsertBefore(call, load_char_code, NULL, Definition::kValue);
     StringFromCharCodeInstr* char_at =
-        new StringFromCharCodeInstr(new Value(load_char_code));
+        new StringFromCharCodeInstr(new Value(load_char_code),
+                                    kOneByteStringCid);
     call->ReplaceWith(char_at, current_iterator());
     RemovePushArguments(call);
     return true;
   }
 
   if ((recognized_kind == MethodRecognizer::kIntegerToDouble) &&
       (class_ids[0] == kSmiCid)) {
     SmiToDoubleInstr* s2d_instr = new SmiToDoubleInstr(call);
     call->ReplaceWith(s2d_instr, current_iterator());
     // Pushed arguments are not removed because SmiToDouble is implemented
@@ skipping 2707 matching lines @@
 
   if (FLAG_trace_constant_propagation) {
     OS::Print("\n==== After constant propagation ====\n");
     FlowGraphPrinter printer(*graph_);
     printer.PrintBlocks();
   }
 }
 
 
 }  // namespace dart