Fix terrible interaction with code flushing.

src/factory.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 1373 matching lines @@
     Handle<FixedArray> literals = NewFixedArray(number_of_literals, pretenure);
     result->set_literals(*literals);
   }
 
   if (index > 0) {
     // Caching of optimized code enabled and optimized code found.
     FixedArray* literals = info->GetLiteralsFromOptimizedCodeMap(index);
     if (literals != NULL) result->set_literals(literals);
     Code* code = info->GetCodeFromOptimizedCodeMap(index);
     DCHECK(!code->marked_for_deoptimization());
+    DCHECK(result->shared()->is_compiled());
     result->ReplaceCode(code);
   }
 
   return result;
 }
 
 
 Handle<ScopeInfo> Factory::NewScopeInfo(int length) {
   Handle<FixedArray> array = NewFixedArray(length, TENURED);
   array->set_map_no_write_barrier(*scope_info_map());
@@ skipping 1025 matching lines @@
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 }  // namespace internal
 }  // namespace v8