[compiler] Add a HandleScope in OptimizingCompileDispatcher::Flush

Bug: chromium:1209774
Change-Id: Ie4d9a673a1c9d91d47cfb75682ff381a4c3075ed
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2897100
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74590}

src/compiler-dispatcher/optimizing-compile-dispatcher.cc

@@ -176,6 +176,7 @@ void OptimizingCompileDispatcher::FlushQueues(
 }
 
 void OptimizingCompileDispatcher::Flush(BlockingBehavior blocking_behavior) {
+  HandleScope handle_scope(isolate_);
   FlushQueues(blocking_behavior, true);
   if (FLAG_trace_concurrent_recompilation) {
     PrintF("  ** Flushed concurrent recompilation queues. (mode: %s)\n",