Maintain a FixedArray for the optimized code map.

src/debug/debug.cc

 // Copyright 2012 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/debug/debug.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 1289 matching lines @@
 
   List<Handle<JSFunction> > functions;
   List<Handle<JSGeneratorObject> > suspended_generators;
 
   // Flush all optimized code maps. Note that the below heap iteration does not
   // cover this, because the given function might have been inlined into code
   // for which no JSFunction exists.
   {
     SharedFunctionInfo::Iterator iterator(isolate_);
     while (SharedFunctionInfo* shared = iterator.Next()) {
-      if (!shared->optimized_code_map()->IsSmi()) {
+      if (!shared->OptimizedCodeMapIsCleared()) {
         shared->ClearOptimizedCodeMap();
       }
     }
   }
 
   // Make sure we abort incremental marking.
   isolate_->heap()->CollectAllGarbage(Heap::kMakeHeapIterableMask,
                                       "prepare for break points");
 
   {
@@ skipping 1264 matching lines @@
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8