Fix a bug with an unused variable.

runtime/vm/intermediate_language.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/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/bootstrap.h"
 #include "vm/compiler.h"
 #include "vm/constant_propagator.h"
@@ skipping 1739 matching lines @@
       case Token::kBIT_OR:
       case Token::kBIT_XOR:
         replacement =
             new BinarySmiOpInstr(op_kind(),
                                  new Value(left()->definition()),
                                  new Value(right()->definition()),
                                  Thread::kNoDeoptId);
       default:
         break;
     }
+    if (replacement != NULL) {
+      flow_graph->InsertBefore(this, replacement, env(), FlowGraph::kValue);
+      return replacement;
+    }
   }
   return this;
 }
 
 
 ComparisonInstr* CheckedSmiComparisonInstr::CopyWithNewOperands(
     Value* left, Value* right) {
   UNREACHABLE();
   return NULL;
 }
@@ skipping 2246 matching lines @@
   set_native_c_function(native_function);
   function().SetIsNativeAutoSetupScope(auto_setup_scope);
   Dart_NativeEntryResolver resolver = library.native_entry_resolver();
   bool is_bootstrap_native = Bootstrap::IsBootstapResolver(resolver);
   set_is_bootstrap_native(is_bootstrap_native);
 }
 
 #undef __
 
 }  // namespace dart