Patch trunk to version 2.2.3.1, reverting change 4401.

src/globals.h

Index: src/globals.h
===================================================================
--- src/globals.h	(revision 4416)
+++ src/globals.h	(working copy)
@@ -428,11 +428,7 @@
   CONSTANT_TRANSITION = 6,  // only in fast mode
   NULL_DESCRIPTOR     = 7,  // only in fast mode
   // All properties before MAP_TRANSITION are real.
-  FIRST_PHANTOM_PROPERTY_TYPE = MAP_TRANSITION,
-  // There are no IC stubs for NULL_DESCRIPTORS. Therefore,
-  // NULL_DESCRIPTOR can be used as the type flag for IC stubs for
-  // nonexistent properties.
-  NONEXISTENT = NULL_DESCRIPTOR
+  FIRST_PHANTOM_PROPERTY_TYPE = MAP_TRANSITION
 };