Merge up to 8597 to experimental/gc from the bleeding edge.

src/scopeinfo.h

Index: src/scopeinfo.h
===================================================================
--- src/scopeinfo.h	(revision 8618)
+++ src/scopeinfo.h	(working copy)
@@ -117,11 +117,6 @@
   // Is this scope a strict mode scope?
   bool IsStrictMode();
 
-  // Does this scope have an arguments shadow?
-  bool HasArgumentsShadow() {
-    return StackSlotIndex(GetHeap()->arguments_shadow_symbol()) >= 0;
-  }
-
   // Return the number of stack slots for code.
   int NumberOfStackSlots();