Use a separate marker value to allocate the arguments object on deoptimzation...

src/objects.h

Index: src/objects.h
===================================================================
--- src/objects.h	(revision 6199)
+++ src/objects.h	(working copy)
@@ -593,6 +593,7 @@
   inline bool IsOutOfMemory();
   inline bool IsException();
   INLINE(bool IsTheHole());
+  INLINE(bool IsArgumentsMarker());

[Kevin Millikin (Chromium), 2011/01/06 14:00:47]

I wonder why we INLINE exactly these two?

[fschneider, 2011/01/06 16:22:49]

Good question. I don't know. Maybe we should use INLINE for the others too.

   inline bool ToObject(Object** obj) {
     if (IsFailure()) return false;
     *obj = reinterpret_cast<Object*>(this);