Move the is_pregenerated flag so it does not overlap other flags.

src/code-stubs.cc

 // Copyright 2011 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 112 matching lines @@
 
     // Update the dictionary and the root in Heap.
     Handle<NumberDictionary> dict =
         factory->DictionaryAtNumberPut(
             Handle<NumberDictionary>(heap->code_stubs()),
             GetKey(),
             new_object);
     heap->public_set_code_stubs(*dict);
     code = *new_object;
     Activate(code);
+  } else {
+    ASSERT(IsPregenerated() == code->is_pregenerated());
   }
 
   ASSERT(!NeedsImmovableCode() || heap->lo_space()->Contains(code));
   return Handle<Code>(code, isolate);
 }
 
 
 MaybeObject* CodeStub::TryGetCode() {
   Code* code;
   if (!FindCodeInCache(&code)) {
@@ skipping 259 matching lines @@
 }
 
 
 bool ToBooleanStub::Types::CanBeUndetectable() const {
   return Contains(ToBooleanStub::SPEC_OBJECT)
       || Contains(ToBooleanStub::STRING);
 }
 
 
 } }  // namespace v8::internal