Improve stores to global variables.

src/ia32/virtual-frame-ia32.h

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 321 matching lines @@
 
   // Invoke builtin given the number of arguments it expects on (and
   // removes from) the stack.
   Result InvokeBuiltin(Builtins::JavaScript id, InvokeFlag flag, int arg_count);
 
   // Call load IC.  Name and receiver are found on top of the frame.
   // Both are dropped.
   Result CallLoadIC(RelocInfo::Mode mode);
 
   // Call keyed load IC.  Key and receiver are found on top of the
-  // frame.  They are not dropped.
+  // frame.  Both are dropped.
   Result CallKeyedLoadIC(RelocInfo::Mode mode);
 
-  // Call store IC.  Name, value, and receiver are found on top of the
-  // frame.  Receiver is not dropped.
-  Result CallStoreIC();
+  // Call store IC.  If the load is contextual, value is found on top of the
+  // frame.  If not, value and receiver are on the frame.  Both are dropped.
+  Result CallStoreIC(Handle<String> name, bool is_contextual);
 
   // Call keyed store IC.  Value, key, and receiver are found on top
   // of the frame.  Key and receiver are not dropped.
   Result CallKeyedStoreIC();
 
   // Call call IC.  Function name, arguments, and receiver are found on top
   // of the frame and dropped by the call.  The argument count does not
   // include the receiver.
   Result CallCallIC(RelocInfo::Mode mode, int arg_count, int loop_nesting);
 
@@ skipping 226 matching lines @@
   bool Equals(VirtualFrame* other);
 
   // Classes that need raw access to the elements_ array.
   friend class DeferredCode;
   friend class JumpTarget;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_VIRTUAL_FRAME_IA32_H_