VM: Small generated code size improvements on x64.

runtime/vm/code_patcher.h

 // 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.
 // Class for patching compiled code.
 
 #ifndef VM_CODE_PATCHER_H_
 #define VM_CODE_PATCHER_H_
 
 #include "vm/allocation.h"
 
@@ skipping 64 matching lines @@
   static uword GetInstanceCallAt(uword return_address,
                                  const Code& code,
                                  ICData* ic_data);
 
   // Return target of an unoptimized static call and its ICData object
   // (calls target via a stub).
   static RawFunction* GetUnoptimizedStaticCallAt(uword return_address,
                                                  const Code& code,
                                                  ICData* ic_data);
 
-  // Return the arguments descriptor array of the closure call
-  // before the given return address.
-  static RawArray* GetClosureArgDescAt(uword return_address,
-                                       const Code& code);
-
   static intptr_t InstanceCallSizeInBytes();
 
   static void InsertCallAt(uword start, uword target);
 
   static RawObject* GetEdgeCounterAt(uword pc, const Code& code);
 
   static int32_t GetPoolOffsetAt(uword return_address);
   static void SetPoolOffsetAt(uword return_address, int32_t offset);
 };
 
 }  // namespace dart
 
 #endif  // VM_CODE_PATCHER_H_