Use explicit push-argument for InstanceSetter instruction.

vm/intermediate_language.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/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 748 matching lines @@
 }
 
 
 RawAbstractType* StoreIndexedComp::StaticType() const {
   UNREACHABLE();
   return AbstractType::null();
 }
 
 
 RawAbstractType* InstanceSetterComp::StaticType() const {
-  return value()->StaticType();
+  // This computation does not have a result value.
+  UNREACHABLE();
+  return AbstractType::null();
 }
 
 
 RawAbstractType* StaticSetterComp::StaticType() const {
   return value()->StaticType();
 }
 
 
 RawAbstractType* LoadInstanceFieldComp::StaticType() const {
   if (FLAG_enable_type_checks) {
@@ skipping 579 matching lines @@
   if (compiler->is_ssa()) {
     ASSERT(locs()->in(0).IsRegister());
     __ PushRegister(locs()->in(0).reg());
   }
 }
 
 
 #undef __
 
 }  // namespace dart