Make saving and restoring of the context around closure calls explicit.

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/flow_graph_builder.h"
 #include "vm/object.h"
 #include "vm/os.h"
@@ skipping 63 matching lines @@
   return ArgumentCount();
 }
 
 
 intptr_t StaticCallComp::InputCount() const {
   return ArgumentCount();
 }
 
 
 intptr_t ClosureCallComp::InputCount() const {
-  // Context and arguments.
-  return 1 + ArgumentCount();
+  return ArgumentCount();
 }
 
 
 intptr_t AllocateObjectComp::InputCount() const {
   return arguments().length();
 }
 
 
 intptr_t AllocateObjectWithBoundsCheckComp::InputCount() const {
   return arguments().length();
@@ skipping 452 matching lines @@
 }
 
 
 RawAbstractType* CatchEntryComp::StaticType() const {
   UNREACHABLE();
   return AbstractType::null();
 }
 
 
 }  // namespace dart