Experimental: thread live register references to deferred code....

src/virtual-frame-ia32.h

Index: src/virtual-frame-ia32.h
===================================================================
--- src/virtual-frame-ia32.h	(revision 969)
+++ src/virtual-frame-ia32.h	(working copy)
@@ -85,9 +85,6 @@
 };
 
 
-// A result in a register just means that the value can be read from the register
-
-
 // -------------------------------------------------------------------------
 // Virtual frame elements
 //
@@ -345,7 +342,12 @@
   void Push(Handle<Object> value);
 
 #ifdef DEBUG
+  // True if all values in the frame are backed by memory.
   bool IsSpilled();
+
+  // True if the two frames have the same state (in which case they are
+  // interchangable).
+  bool Equals(VirtualFrame* other);
 #endif
 
  private: