Fix crash that occurs when we're forced to delete a global...

src/ia32/stub-cache-ia32.cc

 // Copyright 2006-2009 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:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1131 matching lines @@
   __ j(not_equal, &miss, not_taken);
 
   // Get the value from the cell.
   __ mov(eax, Immediate(Handle<JSGlobalPropertyCell>(cell)));
   __ mov(eax, FieldOperand(eax, JSGlobalPropertyCell::kValueOffset));
 
   // Check for deleted property if property can actually be deleted.
   if (!is_dont_delete) {
     __ cmp(eax, Factory::the_hole_value());
     __ j(equal, &miss, not_taken);
+  } else if (FLAG_debug_code) {
+    __ cmp(eax, Factory::the_hole_value());
+    __ Check(not_equal, "DontDelete cells can't contain the hole");
   }
 
   __ ret(0);
 
   __ bind(&miss);
   __ DecrementCounter(&Counters::named_load_global_inline, 1);
   __ IncrementCounter(&Counters::named_load_global_inline_miss, 1);
   GenerateLoadMiss(masm(), Code::LOAD_IC);
 
   // Return the generated code.
@@ skipping 201 matching lines @@
   GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC);
 
   // Return the generated code.
   return GetCode(CALLBACKS, name);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal