[debug] make sure switching to debug fcg code works.

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 <memory>
 
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 1307 matching lines @@
         suspended_generators.Add(handle(generator_obj));
       }
     }
   }
 
   // We do not need to replace code to debug bytecode.
   DCHECK(baseline_exists || functions.is_empty());
   DCHECK(baseline_exists || suspended_generators.is_empty());
 
   // We do not need to recompile to debug bytecode.
-  if (baseline_exists && !shared->HasDebugCode()) {
+  if (baseline_exists && !shared->code()->has_debug_break_slots()) {
     DCHECK(functions.length() > 0);
     if (!Compiler::CompileDebugCode(functions.first())) return false;
   }
 
   for (Handle<JSFunction> const function : functions) {
     function->ReplaceCode(shared->code());
     JSFunction::EnsureLiterals(function);
   }
 
   for (Handle<JSGeneratorObject> const generator_obj : suspended_generators) {
@@ skipping 1226 matching lines @@
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8