Fix warning about an unused private field.

runtime/vm/flow_graph_builder.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_builder.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/code_descriptors.h"
 #include "vm/dart_entry.h"
@@ skipping 1845 matching lines @@
   LocalVariable* var() const { return var_; }
 
   ~TempLocalScope() {
     Value* result = visitor_->Bind(new LoadLocalInstr(*var_));
     visitor_->DeallocateTempIndex(1);
     visitor_->ReturnDefinition(new DropTempsInstr(1, result));
   }
 
  private:
   EffectGraphVisitor* visitor_;
-  Value* value_;
   LocalVariable* var_;
 };
 
 
 void EffectGraphVisitor::BuildLetTempExpressions(LetNode* node) {
   intptr_t num_temps = node->num_temps();
   for (intptr_t i = 0; i < num_temps; ++i) {
     ValueGraphVisitor for_value(owner(), temp_index());
     node->InitializerAt(i)->Visit(&for_value);
     Append(for_value);
@@ skipping 1665 matching lines @@
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, function_name, reason) + 1;
   char* chars = Isolate::Current()->current_zone()->Alloc<char>(len);
   OS::SNPrint(chars, len, kFormat, function_name, reason);
   const Error& error = Error::Handle(
       LanguageError::New(String::Handle(String::New(chars))));
   Isolate::Current()->long_jump_base()->Jump(1, error);
 }
 
 
 }  // namespace dart