Switch GetConcurrentlyOptimizedCode to MaybeHandle.

src/optimizing-compile-dispatcher.cc

Index: src/optimizing-compile-dispatcher.cc
diff --git a/src/optimizing-compile-dispatcher.cc b/src/optimizing-compile-dispatcher.cc
index 7062db640d513341c48ad485412d6e343a5299a8..6ae8708d2cd31168e180b18259626afb12968f3c 100644
--- a/src/optimizing-compile-dispatcher.cc
+++ b/src/optimizing-compile-dispatcher.cc
@@ -244,9 +244,9 @@ void OptimizingCompileDispatcher::InstallOptimizedFunctions() {
         }
         DisposeOptimizedCompileJob(job, false);
       } else {
-        Handle<Code> code = Compiler::GetConcurrentlyOptimizedCode(job);
+        MaybeHandle<Code> code = Compiler::GetConcurrentlyOptimizedCode(job);
         function->ReplaceCode(code.is_null() ? function->shared()->code()
-                                             : *code);
+                                             : *code.ToHandleChecked());
       }
     }
   }