Support inlining at call-sites with mismatched number of arguments.

src/x64/frames-x64.h

Index: src/x64/frames-x64.h
diff --git a/src/x64/frames-x64.h b/src/x64/frames-x64.h
index 2626954ac6dce2d0de78db82edf44b4d3a498867..72c02845876cfeac33533ad4b158731c3a313878 100644
--- a/src/x64/frames-x64.h
+++ b/src/x64/frames-x64.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 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:
@@ -87,6 +87,7 @@ class ExitFrameConstants : public AllStatic {
 
 class StandardFrameConstants : public AllStatic {
  public:
+  static const int kFixedFrameSize    = 4;
   static const int kExpressionsOffset = -3 * kPointerSize;
   static const int kMarkerOffset      = -2 * kPointerSize;
   static const int kContextOffset     = -1 * kPointerSize;